In my experience the computer adaption cycle seems to be 40 to 50 miles. If you have driven that many miles, likely you are out of the woods. Note, however, that cleaning a MAF is often a temporary fix, and they tend to fail shortly after a cleaning anyway. You might want to start saving up for a new MAF/AMM.

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280