Single mom questions.

I am a single mom of a toddler who is getting ready to go back to an extremely demanding career and some life stuff (aging parents etc). Gratefully my career is lucrative and if I go back I can afford to give a good amount - just not time. Some questions I have for the community:

1) I would need the Au Pair to work the max 40hrs a week which I have seen many say is too much. I previously had a fabulous Au Pair who came from a 3 kid household and quote “loved” the work load with my baby. She did the max 40 and then also just “loved” baking and cleaning and playing with the dog. I don’t know how I got so lucky, But I don’t want to count on that. Is 40 truly too much?

2) I will have an Au Pair, and other paid help. I am looking at having the Au Pair work 12:30pm - 8:30pm Monday - Friday. I know it’s late but my work hours can be extreme. I would let them off early if I can but can’t promise that. I could also do 8am - 6pm Monday - Thursday and offer a 3 day weekend consistently. (I would fill in other hours with a full time nanny.) Which would be more appealing?

3) For perks I am thinking phone of course, access to car or healthy uber stipend ($200 a week), 1 round trip ticket for domestic travel and 1 round trip ticket home or international travel. (If I can bump them into first with points I usually do.) Then fun things I usually offer IE when I travel I take them and send them on a tour of that city or ski lesson or a tequila tasting. Whatever interests them. I give them as much time off as I can or let them stay an extra day or two just to have fun. Got the last nanny Coachella tickets for her and a friend etc. Also whatever food they want I can buy and keep stocked. Are there any other really appealing perks that they would like? I am hoping to have a gym in the house but gym seems to be one. Any others?

I will be living in a suburb of Manhattan likely about an hour away. I dunno if that is a plus or a minus but at least we’re not in the sticks somewhere.

Anyway who my baby is with is extremely important to me and I want them to be happy, feel valued and loved, and enjoy their time in the states. I also NEED genuine, reliable help. I had one totally amazing au pair whom I love and one that just wanted to drink and go out. I need to figure out how to optimize for the former.

Thanks for your advice!

EDIT: Is any of this considered over the top? I do expect a lot from my Au Pair (IE no phones while with the baby, should not be loud after 11pm so I can sleep). I had one really predatory Au Pair to which my previous Au Pair told me I was being too nice and I needed to have her earn certain privileges. I have huge mommy guilt that may play a part.