How long should I wait to contact to apologize and gain trust?

I broke my ex boyfriends trust and I want to gain it back. He told me he doesn't trust me right now, trust is earned, actions speak louder than words and that he needs some space. Also he was asking how he knows my opinion won't change in a month. How long should I give him space before reaching out to sincerely apologize and ask what I can do to start rebuilding his trust? I feel that since he said he doesn't trust me RIGHT NOW that I could earn it back?

How long should I wait to contact to apologize and gain trust?
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