I'd reccomend it. It will either make the time go by fast (which it most likely will) or it could make it go really slow, but that won't be boring, your mind will zone out, and you'll be thinking of weird shit, and watching movies in your head. Make sure you get good weed though, don't get anything less than good mid-grade, otherwise it will be a disapointment, and the high will only last for maybe an hour or two, then you'll feel all disapointed and bored as hell afterwards.