Dear ljordanf,

It is not unusual to have the same recommenders for 5,6 or even 8 programs. I agree though, that it is asking for much support and effort on their part and thus you must choose your recommenders wisely. You could split the load a bit if you feel it is too much by asking 1-2 others to recommend you as well. Then you can select which 2 of your 4 you want for each school. Keep in mind, you always want a current or former supervisor for each application.

Good luck,
Lisa