How do you guys bill a client that wants you 'on-call'? Would you agree to be 'on-call' if someone requests?
Let's say you tell a client up front you will be unavailable on a given week (I.e., Christmas, honeymoon etc.,) and they request you be 'on-call' during that time in case of emergencies.
Would you do it? If so, how would you bill for it?