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What evidence is there that before the Fall, conception would have been immediate.
First, there is no evidence. Everything in this thread is speculation at best. Second, since there was not yet a Fall, IMHO everything in the reproductive systems would have been operating at A1 and thus a somewhat immediacy in conception would have been the norm. God had given not only the mandate to be fruitful and multiply, but IMHO the perfect means to do this as well.

Reformed and Always Reforming,