Spoiler:
Stuff 2 of your largest panties. If you do this in under 1 minute, advance 2, and leave in for the next hour.
If it takes you more than 1 minute, move backwards by the number of thongs you own. If this is your second time, to reach this square, use the number of boyshorts you own. For additional times landing on this square and failing the task, write down 6 types of panties you own and then roll a d6 to determine which type to count and move back by.