If you're efficient and methodical I don't see why you couldn't complete an SR in good time. The number of results is a part of this, of course. Some rare searches may bring back a few thousand, but I bet a good number of strategies would benefit from a more balanced eye than a sensitive one. I try to get this across whenever I'm chatting about SRs to ppl, including those who attend our workshop.
[this - among others - made its way through mon office]