Also known as the fussy suitor problem, and I am a fussy suitor. So how many companies should I optimally interview with before theres diminishing returns? The logic being you don't want to accept your first offer but you dont want to just keep interviewing either. A friend was saying 7 is the optimal number. They had this formula: 

Do you want to choose at best among a number of take-or-leave alternatives that you don’t know beforehand? Then:

https://en.m.wikipedia.org/wiki/Secretary_problem