LOL, I wouldnt worry about 2 weeks. When I first started reading the post I was expecting months not days
The amount of time off a horse gets and what he/she will actually forget really depends on the horse. I think the breed has a lot to do with it to. For years I owned thoroughbred and those things I swear never remembered what he had worked on the day before. Always had to start from scratch.
The other horses I had on the other hand always remembered what they were taught no matter the amount of time off they had. I rode this little quarter horse who was fantastic that way. It didnt matter how long he was out for, all you had to do is get on and he remember everything every time. Great animal.