... Unless said machinery is provided to you by the machine elves, of course.

1) Absolutely nobody is going to take heavy psychedelics if they are driving or operating heavy machinery, and if they are, they are either very misinformed or simply don’t care to the point of malice. Driving or operating while impaired is a crime in itself.

2) The effects of DMT wear off in 15-30 minutes, which is why it’s called ”the businessman’s lunch”. Subjectively, however, a person may experience decades of time pass.