Your time, especially during a job search, is incredibly valuable. If you have job searched, especially in the last few years, you know the whole process can take several weeks, or more.
What you may or may not have experienced is having a company completely disappear on you, even after making a verbal offer.
While this is relatively rare, you do not want to be on the receiving end of this unprofessional behavior. In fact, you don’t EVER want to let ANY time slip away waiting on anyone during your job search.
The simple solution is to just remember that until you have put pen to paper for a role, you’re not done.
Do what is in your control and keep job searching until an offer is presented in writing.