It depends. Do you mean:
-You two decide to do something and he constantly makes you wait 30 min - 1 hour without warning
-Hanging out in a group and he shows up 30-60 min later than everyone else.
If the first, just flat out mention it to him once. If the latter, whatever, unless he's constantly making the group late for stuff it's no big deal if he shows up late for hanging out.
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Just that awesome
~InsaneOne