Don’t even think of flushing those plants. Do think about feeding them. Don’t know where you got seeds but Durban gets tall and flower is around 85 days.
Very nice. You indoor folks make me a little envious sometimes, haha.
I agree with @hotrodharley- supposed to be a longer flower time, even with a little Indica mixed in (which a lot of DP has, I’ve read.)
The leaves look Sativa. Looks like a great first grow, to me.
Stay patient. Listen to the indoor guides here.
Don't worry, it's looking good. Is that Dutch Passion DP? It's hard to say how much time you have left, could be another month, just keep feeding and ask again BEFORE you decide to chop, don't want to chop too early!