Have you ever noticed your tent reeking exponentially more while in flower during the night period?
While I do not agree with an excessive 48 hour dark period before harvest, I do agree that it is best to harvest at the end of the regularly scheduled night time period. Every old school 1960's hippie I grew up around practiced an end of night harvest, and it's what I've always done. I've experimented with 24 and 48, and I believe it's best at the end of the regularly scheduled night and anything beyond that is excessive.