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It's not only half an hour.
If they are full time client's, 30 mins a day equates to 2.5 hours extra a week.
Assuming you take 10 days vacation, that means you work 50 weeks a year.
2.5 hours a...

It depends on what suits you.

I officially open at 7.30am. Over the years, I've had the odd request for earlier. For my situation, I don't have young children home anymore, so it's not a big deal...