It is totally fine to leave it for a day or week or whatever amount of time, DMT will never go back to the basic solution.
In fact, what I often suggest is that after people do all the standard 3 pulls, they dont yet discard everything, instead they do one more pull and leave it standing for a couple of days, and occasionally stirring it during those days, and then finally separating it after some days then evap/freeze that pull separately from the other 3 previous pulls... That is a good way to see if there is still some significant amount of DMT left behind.. So if for example that last separate pull still has a big amount, like 20+% of total yield, then one can do yet another pull.. If there is less than 10% of total yield in the last pull, then you know you can throw away everything since you have pretty much exhausted the whole thing.