User blog comment:AgentGoldfish/Q&A AgentGoldfish Style!/@comment-3395649-20130509022744/@comment-1647442-20130509231522

Ah, the eternal question. Far too many factors to consider before nailing down an exact number. I once found a source crediting it to 142 licks. I once did it myself in approximately 75. Further still, one needs to factor in the size of the lick, size of the tongue, amount of saliva, etc. Basically, it can take an infinite number of licks, because there are infinite variables to factor in.