I'm all over the map- if it's been a while, or I'm really revved up, sometimes I'm just about done after 10 seconds. Other times, it can take as long as an hour, perhaps longer (obviously these are rare, and do not occur on the first session that day). I guess on average I'm somewhere in the 10-15 range, usually at which point she starts giving me the "wrap it up" signals.
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