Spin Clockthe time and money arithmetic of a session
Instruments

Instrument 5 · Limits

Limits in numbers

A money limit and a time limit describe the same session in two ways. This instrument converts one into the other at the expected rate, and shows why the average is only a guide.

$
0.01–100.
/min
0.5–60.
%
50–99.9.
$
1–100,000.
min
1–600.

Results update as you type.

Expected cost per minute
$1.00
Minutes until the money limit is used up, on average
40 min
Spins within the time limit
600
Expected cost within the time limit
$60.00

Worked by hand, with the defaults

  1. Expected cost per minute: 10 × $1.00 × (100% − 90%) = $1.00.
  2. Money limit $40.00 ÷ $1.00 a minute = 40 minutes, on average.
  3. Time limit 60 minutes × 10 = 600 spins; expected cost $60.00.

The average is not a schedule

Losses do not arrive at a steady rate. A money limit can be reached well before the average time, or not at all; the spread instrument shows the range for an invented game.

Help is available

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