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			I've gone through this, mostly earlier in my career.
 I've learned that it's best for me to pace myself.  It might take a season or two, but you'll find what frequency of assignments will work for you.  What is the first "to go": is it beong getting mentally prepared for an assignment, or it is being physically drained (ankles, knees, etc.)?
 
 Pacing yourself can difficult if you're, for example, a 2nd or 3rd yr. official where you're starting to really learn many things and you feel that you're learning curve is going through the roof.
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