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@sumitarora15
L11 to L12 – 1 day 16 hours X 27 transformers = 45 days
L12 to L13 – 2 days X 27 transformers = 54 days
L13 to L14 – 2 days 6 hours X 27 Transformers = 60 days
L14 to L15 – 2 days 12 hours X 27 Transformers = 67 days
So if you total the days 45+54+60+67=226 days / 30 days = 7.5 months
But you get gems through portals so that will help you in upgrading the transformers pretty fast only using coins with it!!
From L12 to L15 the timings are all a guess but it will be somehow nearby!!