I only expressed on the first evening I was away because I was engorged. If you're worried about supply, why not take a pump and express every day (or twice?). To be honest, I wsn't worried about supply as I thought it might be a god time to stop anyway but DS3 had other ideas
I agree iwth the other posters Stefka....just express if you feel full - I usually do it in the shower/bath. If you want to express and keep it for later, the hotle should be able to put a bottle of EBM in the fridge if you dare ask!