Kids are 18, 14, 11 and 5. I get about 9 hours sleep at weekends (more if dh is off work as he’s an early riser) and between 7-8 through the week.
My youngest generally sleeps for 11.5-12 hours every night, she has to be dragged out of bed for school in the mornings amidst cries of “just 5 more minutes” and will sleep for just as long if she goes to bed late so we let her stay up til 8.30-9pm at the weekend so we get a lie in.
I know I’m lucky to have a good sleeper, the elder 3 spent years waking at 5am no matter what time they went to bed which nearly killed me off! Also, the 5 year old used to be terrible, she woke every 30-60 minutes for 17 hellish bastard months so I think I’ve earned the good sleeping child now 🤣