Less than 1 minute, my friend!
More than 10 years ago, when I was still working for an international Language Service Provider, I conducted an interview with our customers and our suppliers (translators). I just found an old PPT listing the results for our management at the time.
The question was simple: What pisses you off working with translators? What pisses you off working for customers?
I guess not that much has changed since… (I hope my English has improved since).