Example: 30 people, 3 calls each, 3 min a call
18 minutesuntil the last person hears
87 minutesif one person called everyone
15people make calls; the rest only answer
| Round | People who hear | Last one hears by |
|---|---|---|
| 1 | 3 | minute 9 |
| 2 | 9 | minute 18 |
| 3 | 11 | minute 18 |
| 4 | 5 | minute 15 |
| 5 | 1 | minute 15 |
A round is one step down the tree: round 1 is the people the starter calls, round 2 the people they call, and so on. Everyone starts their own calls as soon as they hear, so rounds overlap in time and a later round can finish before an earlier one.
How it is worked out: each person goes to whoever can call them soonest, nobody makes more than 3 calls, and every call takes 3 minutes. Real calls run long or short, and some people do not answer; a practice run tells you your group’s real number.
Build this tree with your own names. Free up to 12 people; Plus $1.95/month or $19.50/year Free during preview for up to 150.