I we needto convert currency on weekends, there is a small overhead to the conversion rate.
Isn’t it viable to just use friday’s conversion rate on weekends?
During my last stay in London, I was completly aware of that overhead, but i forgot to convert from EUR to GBP for the weekend, so i ended up by slightly overpaying on my payments during the weekend (which i must say still turns out to be more advantageous than using my bank card)