Generally B+, although slower to colonize substrate, is typically a little faster than other cubies on the home stretch. But the amount of time from casing to harvest really depends on average environmental temp and thickness of casing. The thicker the casing of course the longer it takes to get to harvest. But a thicker casing will often support larger flushes and therefore larger harvests. Anyway, for a half inch to one inch casing at an environmental temp of about 82 degrees my B+ typically pinns after 11 days and then takes an additional 4 to 5 days till time for harvest. Lower the temp and it may delay harvest by a couple of days...but you will most likely end up with more potent shrooms. Hope this helps and good growing 
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Peace, Love & Light
[This message has been edited by Shroom Mage (edited December 16, 1999).]