You have until you feel you have to go so if you have the urge to go even though you can hold it in and don’t need to go, you still can’t make Asher Yatzar for your prior bathroom visit. This doesn’t give you a long time as your body keeps generating waste which must be expelled, this can be anywhere from a few minutes to a few hours depending on the individual. So you should say it as soon as you finish washing your hands after using the bathroom.
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