Parenting in itself is pretty easy.
Its the cooking, cleaning, mowing the lawn, DIY, working, getting them to school/childcare, thinking about what they need for school, applying for places, vaccination dates etc, then the financial side of paying the bills and the mental side of having to sort out the car insurance, best energy provider etc etc
The list is endless.
If there are 2 of you then these things are halved and so things are easier.
There are still 2 of you, just 1 is away for a few nights.
Maybe this is a reflection of your marriage but tbh I’d be shocked if you didn’t find it easy.
I hate when an OP is going away for a couple of nights and has to get their MIL to stay over to help the DH with his own kids.
It makes me laugh when Kim K says it’s hard because she’s a single parent with 4 kids - she’s a millionaire with a nanny, chef, cleaner, make up artist, personal assistant etc etc
The actual looking after the kids is the easy bit.
Its doing that on top of everything else on top that’s the tricky part.