Probably depends on the school. Some have word limits for recommenders to stick to and much like essays going well over probably will hurt you. From what I have found most schools are going to online applications and recommendations. So find out if the school recieves them online at which point your recs can fit as much as they can and if it wont accept more then thats the schools size limit.
both my mine wished to complete the paper version. no word limits for UCLA or UCB.