How many times do you wear a bra before washing?

[Howtomakeevery1]

AIBU - to wear once only? It’s costing me a fortune in underwear as they wear out/ grey quickly

Wife used to change during the day, work wear, travel, meetings and home so used to have 2 or 3 bras in use at any time. So I think all week before a wash.
I had no complaints.