I lifeguard a pool with about 100 kids every day and get asked the time between 20 & 60times which disturbs my guarding, so I started telling people I don’t know, which technically is true as I don’t look at my watch every second. What do you think, is that wrong to do?
Maybe you can find or screen print a t-shirt that says “Lifeguard on Duty, Do not Disturb!” or something similar. When bothered simply point to it. (A poster would be simpler, if you can get permission to hang one.)