'holic
the 1st step will depend on how much accumulation there has been upon the airframe. All must be cleared off and could range from 5 to 30 mins or more.
The 2nd step is more predictable. 10 mins a ball park figure for 767.
The hold over time kicks in from beginning of 2nd stage and that can be as low as a few minutes depending upon temperature and precipitation rate.
Hope that is what you wanted