Gentle goodbye nudges

[NameChangeCity123]

AIBU to ask for help ....

How can I politely get MiL to go when I would like her to leave my house? This is an ongoing issue and she has been known to stay for 8 hours before and honestly I'm just not doing that anymore.

Not going to get up and put my pjs on or go for a sleep before anyone suggests those, needs to be something firm but not rude as not looking to cause issues for my DH

Have already had the 'baby goes
Down at this time so we need the house
Empty by this time' conversation on two occasions which were completely ignored

TIA

The people saying it's family, just put up with it clearly haven't experienced it and hope they don't do it to others.
I get on well with my DB, I could visit him and chat for hours but realise DSIL wants their alone time too. I would never let it get to the point where either of them get uncomfortable.
Same for DBF, I leave early enough so they have quality time. It's showing respect to couple/family time.
Being loney/loving someone's company is no reason to impose yourself on them. People just get to resent you, especially when they do try to be accommodating.
It's a case of take, take, take and always has to suit them and their mental health with no regards to yours.
DMIL also visits for 8+ hours a time. We don't have kids and are in a small 1 bed flat, there's nowhere to go. If you go to the kitchen, she follows. She's retired whilst we both work long hours, yet expects us to be available as and when she asks.
Well done OP for handling it well. It's not easy, as when you're soft, people take advantage.

Cant you take the baby out for a walk and then pass by her house on the way home and drop her there when you have had enough. Say "I'll walk home with you for some fresh air" that might motivate her. Later on you might be glad of her babysitting etc if she has a lot if free time. Best not to upset mil. Maybe her problem is she hasn't enough to do.

For the love of god, would people please stop advising the OP to "go upstairs" when she wants some space. She has explained repeatedly that she lives in a small 2-bed flat with no room to get away.

What happened with her visit for tea OP?

Gosh! I wouldn't have wanted my MiL in the house all day, having to chat to her, do chores around her, feed her. Don't you go out shopping or cooking? What does she do then? Surely to goodness you don't have time to sit and chat all day.
There's no way to be polite. You have a life which is separate from hers and she comes to to visit at your invitation, not just on a whim.

Are you in England? Why did your DH invite her the next day? Doesn't he work. I think you have a problem with your DH. Good grief! I've never heard of such rudeness, unless it's accepted in some cultures which I expect is the case here.
It wouldn't normally happen here I'm sure.

I absolutely never visit my AC or GC unless invited or we arrange to meet for a particular occasion and I arrange my departure time to coincide with their wishes. I don't even want to spend all day there. I have my own life.