Sacrifice time, sleep, security, health, wealth, relationships – everything.
The only limit is your ability to do something or not. These sacrifices must be balanced against the rewards.  So, there is only whether a) you CAN endure sacrifices and b) whether the sacrifices you make are worth the return to YOU. https://www.quora.com/How-dedicated-should-an-entrepreneur-be-to-their-start-up-how-much-is-too-much