Sentence:  Everyone is ambivalent about his profession , if he has practised it long <WSD>enough</WSD> , but there were still moments when he loved the stage and all those unseen people out there , who might cheer you or boo you , but that was largely , though not entirely , up to you . 
Meaning of the word marked with <WSD> tags:  as much as necessary; (`plenty' is nonstandard) "I've had plenty, thanks"