Well if "surf" is defined as "browse around aimlessly". Meaning, with no particular end goal, then my answer would be "off-time only". This is probably better defined with:
Searching for an answer - mostly work hours
Answering questions, recreational reading - off-time only

Although, after lamenting for a bit, I took "surf" to encompass doing anything at all at perlmonks.org. I thus voted "no distinction".
Possibly because there is no real distinction between work-hours and off-time for me these days. (sniffle... hire me!)

-xtype

In reply to I surf PM during by xtype
in thread I surf PM during by jcwren

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