How much does it take for a 24yr old guy to get over his ex ( 4year relationship)?

how much does it take for a guy who was really into a serious relationship to get over her , if he was willing to propose but then some factors went in between such as ( his mother dissaproval and her actions afterwards changed towards him as she began cheating ) , he broke up with her and its been 1 years and a half and he is not ready to commit ,
How much does it take for a 24yr old guy to get over his ex ( 4year relationship)?
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