How many hours for first clearance of upper lip?

This thread was an eye opener. I thought it would take no more than 1 hour to clear the area discussed in this thread.

This means that it will at least take 6 hours to clear hair from my cheekbones and slightly below it.Perhaps 20 hours to clear my buttocks…

Does thinning out hair from an area require clearing all hair from the area or just selected?