Hey, glad you're interested.
First, Say Charmander learns Ember at level 8. As a move Tutor, Charmander now learns it at level 6 instead. That's the way it works for all pokemon you own.XD
Second, an RP day lasts as long as it lasts. I can't put it anymore clearly than that.Some days last longer than others, because some people do more things in a day. But if the day drags on too long, I'll make it the next day myself.
Third, yes. Yes you can teach a fire type a water move. But be prepared to spend a lot of ABP. A whole lot. XD Same with Legendary moves. You can teach them, but it will be very expensive.