Sound to me like you need a word with your partner. You know your business arrangements, we don't. Then on top of that I wonder how many customers want you working in their yard at 6:30 in the morning, I sure wouldn't want you in mine. Now being retired I start my day when I feel like it. When I was working I started my day at 4:30 AM. Also I find some people just don't like work, could that be your partners problem?
I agree with you. If starting time is 7AM that would be starting time. Maybe you start 2 hours early and at quitting time he works two late? It sounds to me like I wouldn't want him as a partner, but you known your business I don't. Has he got the money and you do the work? Is he a good friend? I find partners don't work and you would be much better off just hiring someone to work for you. As I see it, it cost you money either way.
It's funny! I have the money, we do equal work. Haha! Different work ethics I guess. He's 26 I'm 34 it's the way I've always been. He doesn't mind working till late, I do, I'd rather get home at a decent time to see my 4 kiddos. He does his work I do mine, it all gets done.