I don’t think that you can drink ‘too much’ of it. 1 pint is quite a lot tho. I drink 2/3 of a pint and I’m in week 9-10. It all depends on how bad your die off is and how much you like kefir.
Try to find organic coconut milk or organic goat milk (if you don’t like coconut milk, like me).
24 hours is normal, you can leave it even longer.