To become a successful entrepreneur, of course, requires a process and has failed a lot, the big entrepreneur we see today is successful when he tells it, he will say that he has experienced many failures and is almost desperate because of bankruptcy and so on, but with enthusiasm and learning from mistakes they can success.
Those who are successful now have failed in the past, but I don't think there is a need for too many failures, because when there are more failures in an entrepreneur, he will get worse and take longer to get back up. The success of an entrepreneur is also due to long hard work and never give up and what don't forget is his experience in the field he is in.
Because when he had failed once or twice in his attempts, the third time would definitely not fail again because he already knew where the fault lies in the past which caused him to fail.