Well,
As a female, I can tell you that underwear laundering is pretty much part of my daily
travel routine. I wash out my smalls every day before bed and they are usually dry.

For our family trip to Rome two weeks ago, we stayed in an apartment that had a washer and lots of clothes racks. Worked great for my dad and partner, they both had dry clothes within hours.

My brother who met us at the end of another trip had 12 days worth of smalls packed. He just never thought of doing laundry.

lala