My indoor hydro grows I usually start harvesting around mid week 8 and finish around 9 weeks. I normally flush for a week or 2 which starts the leaves fading but that may be different if using soil. Still I can't see it being finished around 5 - 6 weeks. I Imagine if you wanted a more uplifting high you could go a little early maybe mid week 7 at the possible sacrifice of yield. My advice is have patience and use your first grow as a learning experience. You need to see a plant go a little too long and next grow you will know what to look for. From my experience in my conditions I need to go to the longer side of what a seed breeder says. If they say 7-8 weeks I am really looking 8-9 weeks. I have a feeling they want to under estimate so they sell more seeds because everybody wants to save time

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Harvest a bud or 2 now and compare it to the rest that go the duration.