TL;DR
In our worked example, a 4-minute sales call takes 7 minutes to review by ear with scoring, so reviewing 3 calls per caller a week for 10 callers takes 3.5 hours. Reading an AI summary first and listening to 40% of each call cuts that to 2.8 hours. The bigger saving is callers' note-writing: about 40 hours a week across the team, if checking a summary replaces typed notes.
In our worked example, reviewing a 4-minute sales call by ear takes 7 minutes once you add scoring, so a manager who checks 3 calls per caller a week for a 10-person team spends 3.5 hours. Reading an AI summary first and listening to only 40% of each call brings that to 2.8 hours.
The bigger saving is not the manager's. If callers check an AI summary instead of typing their own notes, the same team gets back about 40 hours a week. The formulas below let you run the numbers with your own inputs.
The formulas
Use these symbols for your inputs:
- A = callers, C = connected calls per caller a day, D = working days a week
- L = average call length in minutes, S = calls reviewed per caller a week, P = minutes to score one call
- R = minutes to read one summary, F = share of the call you still listen to after the summary
- N = minutes a caller spends typing notes after a call, n = minutes to check an AI summary instead
Then:
- Calls a week = A × C × D
- Calls reviewed a week = A × S, and coverage = calls reviewed ÷ calls a week
- Review time by listening = A × S × (L + P)
- Review time with AI summaries = A × S × (R + F × L + P)
- Manager time saved = formula 3 − formula 4
- Caller note time saved = calls a week × (N − n)
- Value of time saved a month = (manager hours saved × manager cost per hour + caller hours saved × caller cost per hour) × 4.33
Formula 4 keeps the scoring time P the same, because a summary tells you where to listen but you still have to judge the call. In formula 7, 4.33 is the average number of weeks in a month (52 ÷ 12).
Worked example: 10 callers, 40 calls a day
Example inputs, chosen by us to show the method. Replace them with your own; none of them is an industry average. Every result below is our calculation from these inputs.
- 10 callers, each with 40 connected calls a day, 6 days a week
- Average call: 4 minutes. Review sample: 3 calls per caller a week, 3 minutes to score each
- Summary reading: 1 minute. After reading it, the manager listens to 40% of the call (opening, objection, close)
- Manual notes: 1.5 minutes a call. Checking an AI summary instead: 0.5 minutes
- Manager cost ₹50,000 a month and caller cost ₹20,000 a month, over 208 working hours (26 days × 8 hours): ₹240 and ₹96 an hour
Step 1. Volume. 10 × 40 × 6 = 2,400 calls a week. The sample is 10 × 3 = 30 calls, so coverage is 30 ÷ 2,400 = 1.25%.
Step 2. Review by listening. 30 × (4 + 3) = 210 minutes = 3.5 hours a week.
Step 3. Review with AI summaries. 30 × (1 + 0.4 × 4 + 3) = 30 × 5.6 = 168 minutes = 2.8 hours a week.
Step 4. Manager time saved. 210 − 168 = 42 minutes a week. Over a month, 42 × 4.33 = 182 minutes, about 3 hours, worth 3.03 × ₹240 = ₹727.
Step 5. Or review more calls in the same time. 210 ÷ 5.6 = 37 calls instead of 30, about a quarter more.
Step 6. Caller note time. By hand, 2,400 × 1.5 = 3,600 minutes = 60 hours a week. Checking summaries, 2,400 × 0.5 = 1,200 minutes = 20 hours. Saved: 40 hours a week, 4 hours per caller. Over a month, 40 × 4.33 = 173.2 hours × ₹96 = ₹16,627.
Step 7. Total value of time saved a month: ₹727 + ₹16,627 = ₹17,354.
| Measure | Listening only | With AI summaries |
|---|---|---|
| Manager review time a week | 3.5 hours | 2.8 hours |
| Calls reviewed in 3.5 hours | 30 | 37 |
| Callers' note-writing time a week | 60 hours | 20 hours |
| Value of time saved a month | Baseline | ₹17,354 |
What the numbers say
- Summaries trim the manager's review by about a fifth in this example. Scoring still takes the same time, so 42 of 210 minutes is the whole saving. Their real use in review is choosing which calls to open.
- Note-writing is where the hours are. Forty hours a week across 10 callers only materialises if callers check the summary and stop writing their own notes.
- Reviewing every call by ear is out of reach. Listening to all 2,400 calls would take 160 hours a week, and even reading every summary would take 40. Without automated scoring, sampling is the only workable option.
Set the value of time saved against what your calling tool costs at your call volume. Per-user fees and talk-minute charges both grow with the team, so price the tool for your own team size and minutes.
How many calls should you review per caller?
Our rule of thumb is two to three a week for a small sales team, about 9 to 13 a month. In the example that is 1.25% coverage, and it is in line with practice guidance for support teams: a 2017 Customer Service Life article puts a typical phone-support QA sample at six to a dozen calls per agent a month. Pick the calls on purpose: one random call, one lost lead and one with an objection, as set out in our weekly call audit process.
The review is only half the job. What you do with it in the next 20 minutes decides whether calls improve, which is what our call coaching routine covers.
Google Sheets version
Open a blank sheet, click cell A1 and paste the first block; click B1 and paste the second. Each line lands in its own row, and the lines starting with = become formulas. Then change the numbers in B1 to B12 to your own.
Column A (paste into A1):
Callers
Connected calls per caller a day
Working days a week
Average call length (min)
Calls reviewed per caller a week
Scoring time per call (min)
Summary reading time (min)
Share of call still listened to
Manual note time per call (min)
AI summary check per call (min)
Manager cost per hour (Rs)
Caller cost per hour (Rs)
Calls a week
Calls reviewed a week
Coverage
Review hours a week by listening
Review hours a week with AI summaries
Manager hours saved a week
Caller note hours saved a week
Value of time saved a month (Rs)
Column B (paste into B1):
10
40
6
4
3
3
1
40%
1.5
0.5
240
96
=B1*B2*B3
=B1*B5
=B15/B14
=B15*(B4+B6)/60
=B15*(B7+B8*B4+B6)/60
=B17-B18
=B14*(B9-B10)/60
=(B19*B11+B20*B12)*4.33
With the example inputs, B21 shows about 17,355, the same as step 7 give or take rounding. Format B16 as a percentage to read the coverage.
Where the summaries come from
TalkEasy by GrowEasy transcribes each recorded call and writes a summary of the customer's requirement, discussion points, questions, objections, next follow-up and outcome, usually within a couple of minutes. Our guide to the call summary format shows what a good one contains, and the 20-call test in our AI call analysis guide checks whether a tool's summaries are accurate enough on your calls to replace manual notes.
If your callers already write short, accurate notes, the note-time saving will be smaller than in this example; run the numbers with your own N before you decide.
See how TalkEasy's AI call summaries work
Last reviewed 24 September 2026.
