Since this is an AUTO strain ( one of my faves ) my breeder packs state a short run between 45 - 50 ( which a little fast ) but I push them to around 55-56 looking for more of the plant eating it's stored nutes ( and more yellow / dead drop off ) to the leaves. It should be on a water only diet. All the blooming it will ever do is done after day 48.
If you can't wait , put into darkness ( 24 hours ) around day 47-49 ) . One of its main characteristics is it's exceptionally shorter life than other strains. The breeder packs should be a guide only , check your triches and chop when see the most cloudy.
AUTOS are very good about finishing as listed on strain characteristics.
Remember with AUTOS the initial light cycle you choose from the start dictates how well your plant yields. I choose the middle ground 18/6 ( both for energy cost / yield ) .
12/12 gives me somewhat less. Hydro / soilless AUTOS produce the highest yields .
24/0 ( CFL ) produces better ( with mixed 2700k / 5000k ) than 18/6 .
Here she is around day 43 of 75 ( blue mammoth ) and points upward her leaves in happiness. This is absolutely my favorite way to do autos. This will be my 14th auto ( besides that little ( Auto Acid ) to the left. Let them run the course.