If it's urgent I always get to it ASAP. Also I get the PM via Tapatalk, no need to send them all over the place. I simply can't access the ACP via mobile so sorted it right when I got home, was out all day.
Instead of doing something on a whim and going crazy when someone isn't there exactly when you need them, plan ahead when to release a feature of substantial size, then I'd have been there to help you with it.
Ryudo wrote: sometimes forgets. Just remind him every so often if it's been more than a few days.
Never forget, simply prioritize.