Conversion time

Conversion time is the amount of time it takes for a setting to go through a series of units.

For example: Three units Connected in series #1--#2--#3, each unit has two lights; one red and one green. Say the user pushes a button on unit #1 to tell it to turn green and tell all the other units to turn green.
 * 1, #2, and #3.

This would be a simple breakdown of this process:
 * 1) button push
 * 2) Unit #1 turns green.
 * 3) Unit #1 sends signal "Turn green".
 * 4) Unit #2 Receives signal "Turn green".
 * 5) Unit #2 Asks Unit #1 Are you sure about signal "Turn green".
 * 6) Unit #1 responds to Unit #2 "True". (e.g. "yes")
 * 7) Unit #2 Turns green.
 * 8) Unit #2 sends signal "Turn green".
 * 9) Unit #3 Receives signal "Turn green".
 * 10) Unit #3 Asks Unit #2 Are you sure about signal "Turn green".
 * 11) Unit #2 responds to Unit #3 "True". (e.g. "yes")
 * 12) Unit #3 sends signal "Turn green".

But there is no other unit to receive (so nothing happens). The time it takes for all units to "turn green" would be the "conversion time".