This is the number of minuets (up to 3000 minutes from power-up) during which the compensations specified in the Settings 110-112 are applied. 

Overview: When the machine is powered on, if Setting 109, and at least one of Settings 110, 111, or 112, are set to a nonzero value, the following warning will be displayed:
CAUTION! Warm up Compensation is specified!
Do you wish to activate Warm Up Compensation (Y/N)?
If a ‘Y’ is entered, the control immediately applies the total compensation (Setting 110,111, 112), and the compensation begins to decrease as the time elapses. For instance, after 50% of the time in Setting 109 has elapsed, the compensation distance will be 50%.
To “restart” the time period, it is necessary to power the machine off and on, and then answer “yes” to the compensation query at start-up.
CAUTION! Changing Setting 110, 111, or 112 while compensation is in progress can cause a sudden movement of up to 0.0044 inch.
The amount of remaining warmup time is displayed on the bottom right hand corner of the Diagnostics Inputs 2 screen using the standard hh:mm:ss format.