Miralax (polyethylene glycol): There is really no set time limit. However, the longer it sits dissolved in water, the thicker it gets and becomes more difficult to drink. If you let it sit long enough after disolving, it will eventually become impossible to get down. Just for practical reasons, i would recommend drinking the disolved MiraLAX (polyethylene glycol) as soon as possible after you prepare it.
Answered 1/7/2021
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