His schedule is standard for non custodial parents- every other weekend plus one evening a week.
I know this could be rediculous question, but can't you talk to your ex and ask her for more time off. I guess sometimes I live in the dream world where both ex's try to be civil after a divorse. If that is not your case than sorry about the question. Good luck to you. I bet you are a great Dad and the kids know that don't worry.