I wouldn't worry about it. Film an hour on one tape then change the tape. Given that you'll be speeding the clip up by factor of a couple of hundred then, during the one minute tape change you'll lose only a handful of frames from your sequence. No one would notice that.
The only worry is if your tape load is from the bottom and you have to remove it from the tripod to do it, the the 'aim' of the camera may change ever so slightly.
Or, if your camera is compatible you can control the camera from a PC by investing in some time lapse software. The sort of thing used by animators who play with plastecene all daqy long