I've passed some the easier Cleps with 3-4 full days of cramming. They are:

Principles of Mgmt
Analyzing and Interpreting Lit (not much study at all required here)
Into to Psych/Human Growth and Development (I took both exams on the same day since they overlap)

I think you could take an exam a week with some of the "easier" exams, particularly if you have a good memory. Others will require more study time.

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Credits to date:
84 -Traditional
6-CLEP Analyz. & Inter. Lit (68)
3-CLEP Princ. of Mgmt. (73)
12-FEMA
3- DSST Environ. & Human. (53)
3 - Intro.to Psych (66)
3 - Human Growth & Dev (61)
6 - Humanities (72)