I'm visiting my parents for the holidays, this will be the first time I've been in boy mode 24/7 since I accepted that I was trans. I'm kind of interested in figuring out how long I can go before I have to do something girly.

Feel free to place your bets now as to how long I last.

Several months ago, for certain "reasons", I had to be in guy mode for a particular errand - that was after nearly six months straight of 24/7 girl mode. I actually had a not-so-mild panic attack in the process. It was horrible... thank god it was only for one hour. Never again. Never.

So be careful, if you've become mostly or completely accustomed to being in girl mode you might find fitting into guy mode more difficult than just "not acting girly"...

I'm not that far along, I'm only in girl mode in my apartment right now, and I'm not out to anybody but my therapist. I feel that transitioning is something that will happen at some point in my life. However I tell myself that I may be able to delay it for a while if I need to. If I can't go 10 days without problems then that's information I need. I'm prepared to underdress if I need to but I am interested in finding this out.

You'll probably do OK then.

I went to an all boys high school so I learned how to keep "feminine behaviour" relatively under wraps - mind you, society does a pretty good job of gender enforcement anyway so you probably know how to keep it under wraps without even trying too hard.