ZkittleZOG Auto Greenhouse Barney's Farm

So she has moved past week 9 - starting to ripen and is putting on weight - - pistils still creamy white with a few turning orange. Trichomes clear/cloudy mix and so will give her one more week of feeding (Vitax Q4 - 7.5mg and 10g of seaweed) and then think about starting to flush every two days around day 69/70. Across all my grows it seems I will be a week or maybe two over the estimated harvest date (70 days for ZkittleZ OG from Barney's Farm) - probably environmental factors at play, does a greenhouse (and shitty weather) slow things down? Does anyone know much weight does this strain tends to add in last few weeks (including the flushing period....) ? It is all new to me, but I am genuinely enjoying the experience in of itself.... despite the moments of anxiety when discovering something new (outdoor/GH challenges), there is something incredibly peaceful about the whole process.