blueshoes - usually, children will be dropped at my house in the morning. Sometimes they come for breakfast (sometimes, they've needed washing and dressing too, but this usually only applies to much younger children - not the schoolchildren, although I'm a dab hand at doing ponytails).
I collect children from school in the afternoon, with younger ones in tow (but it becomes an outing for us, it's not some "boring journey" they have to endure). We have snacks, and we play. I don't supervise homework, mainly because it's never actually been discussed. Will have to ask the parents tomorrow!
Some childminders will operate 24hours/day, but not many. I am happy to do early starts. I currently finish at 6pm, although it can occasionally be later. I would prefer not to work later, purely because I have my own (grown-up) family and want to enjoy my leisure time. I know lots of minders who work much later than me on a permanent basis, and are happy to do so.
Childminders can set their own rates (probably hourly) and can work whichever hours they want too, which is why parents may have problems if they don't get home till 9pm or work shifts. Many minders provide whichever meals are required. The difference between childminders and nannies etc. that you have in your own home, is that childminders tend to be the ones "dictating" how they work, rather than the parents setting the rules. (Hope that didn't sound at harsh as I think it does!)
I personally am happy to have schoolchildren in the holidays. Some won't. We have a brilliant time!