with out doubt the last week is the most crucial.
1. you have already come this far
2. you are dying to smoke it which makes it the longest
3. you have just spent 3 months or more raising this [or these babies] and if you get this last week wrong the whole 3 months was a waste of time.you have already grow some weed your buds look big and fat but if you dont get the harvest of the most important bit bang on time [the thc at its best] in my opinion just as the thc balls are just starting to turn amber then you might aswell go and buy it instead
4. and just when you think that last week is done all 8 weeks are up [according to the grow guide] its still got at least one left or two at the mo as the temperatures are down