Rarely do you see people working with others using trust pilot and Google maps review the way I am doing today (12/12/2019).
That is because I was lucky to have been doubted by naysayers and blocked by senior managers who wanted to protect their own jobs or the recruitment agency was not able to see my worth. But that is OK because grace has lead me here.
Depending on the task at hand. 4 -16 weeks is long enough to know if you are getting real value for your money or just buying a cooked up concept and empty promise from a blagger you trusted but was destined to fail you without accountability.