Ohiogal,
We don't have a legal visitation schedule laid out in court docs. I did, however, offer her the ability to see her every other week (we swap every 7 days) while she has the ability to do this. If I move, we revert back to what the divorce papers said leaving me with custody, and if she moves, she loses visitation as frequent as it is now. We have been doing this for 2.5 years.
To answer your question directly, she would lose 6 weeks (12 weeks of vacation), though I would arrive midway in the vacation after my school finishes.
To try and be as specific as possible, I have an interim child support order granting me both physical and legal custody dated 13 Jun 06. I have a decree of divorce dated 5 May 06 stating "Findings in Fact: Child custody shall be as follows: a. Defendant "me" shall have sole legal custody of the parties' minor child and the parties shall have joint physical custody of her for the 6 weeks following Apr 7, 2006 hearing. The child shall be returned to the father's custody in Texas no later than May 1, 2007. The child shall be returned to the father's custody on May 1, 2007. "
Later down the page it states: "Conclusions of Law: after a period of six weeks from April 7, 2006, during which the father shall have sole legal custody and the parties shall have joint physical custody that the mother shall also begin to have joint legal custody of the child as well. It is in the best interest of the parties' minor child that she should follow the same physical custody schedule set out in the Findings in Fact." This as well is on the 5 May 06 document.