I'm with ovrrnbw on this. That first week is strange.
After that, you get into a routine of the new norm.
I'll make a suggestion here ( which is how i work ) which benefits both me and my children.
I spend 100% of the time with my children when they are with me and awake.. Board games, lego, movie, cludo, arts and crafts, cooking together etc etc. My laptop stays off and my phone sits on silent.. Its me and them. I do the basic "keep on top (ie dishes etc ) when they go to bed or with them if they want to join in ( ie D5 loves drying dishes ) .
When they are not with me, its a case of keep on top of the mess we caused when they were here.. Hoover, clothes washing, cleaning, ironing etc.. Basically the chores that as a "family" you would probably do day to day. This eats into GAL a lot, but my priority will always be my children. Any other free time i have see's me hitting the home gym or under a car at the weekend.
I love my life - and its easy to get selfish...
All WW are selfish - You just need to be the rock for your children. My 100% thing takes it to the extreme, but its my choice.. They are not children forever, so i cherish all the time i can with them, as in 10 years they will be out with friends.. Just little things like "sitting down as a famly" to eat, or not sitting there on your phone make a big difference to children, as they arent daft - they see you are invested in quality time with them.. and they will appriciate it.
You will love it
Previous username - Helpme123.. A name chosen at a desperate time..
Now Mr Brightside.. coming out of my cage, and doing just fine.