As to the speed with which you "fill" yourself, any flow rate which does not cause you serious discomfort is ordinarily all right.
As long as you don't have any real kidney disease, or serious discomfort [above 7 on my 10 point, Discomfort Level Scale (DL), you should be in a safe range.
Anyone who wants to chat further, or needs a high-quality latwx hose, as a gift from me is invited to call or write.