I have 3 aged 5, 3 and nearly 1 and find it difficult.
But on a normal day, if no swimming or music lesson (that is only one day a week) and not on a Friday - on Fridays everyone comes home and does what they want and then we have Pizza or Fish n Chips or a pie out of the oven at around 6pm usually with friends.
So normal day (don't forget 1 fewer kids than you) DD1 is 5, DD2 is 3 and DS is nearly 1. Also caveat with - this is my plan and it doesn't always (often) go according to plan:
3.20 Get in from school, Shoes and coats in cupboard by kids
3.30 Snack - apple and biscuits and drink.
Kids play all together and with pets
4.15 Take DS to cot for short nap before Tea and DDs watch telly until Teatime. I spend 45 mins making tea, laying table, emptying dishwasher, putting away clean clothes etc....
5.00 Get DS up and extract DDs from telly.
Yell at kids for poor table manners, dish out punishments force kids to eat unwanted food etc.... Everyone nicer and happier after tea.
5.45 Wash-up, load dishwasher, wipe down surfaces and sweep floor DD1 does spelling and music practice usually while I tidy up, the other two just mill about and play.
6.00pm Pour first glass of wine.Bath if bath night (which is everyother night) or just more playing.
6.30pm Put DS to bed, after a bottle and a cuddle, the DDs usually come up and play in room while that happens or if they are doing my head in I put them in front of the telly again!
7.00pm DD2 into bed with a story and milky drink.
Then I try to get DD do her school reading books ( about 70% success rate)
7.30pm Pour second glass of wine, DD3 to bed with a chapter or two of a book and milky drink - works well if DD2 already asleep as they share a room. Spend 10 minutes getting arsey with DD2 as tired and crochety by then (me, not her!)
Spend about an hour going back up and down the stairs for drinks of water, to put music on, find cuddlies etc.
If am organised I usually pop across road to supermarket at 7.30pm
8pmish Pour third glass of wine Prepare dinner for me and DH
9pm ish Pour fourth glass of wine, eat dinner with DH,
9.30pm Fall asleep on sofa (having left pots and plates from our dinner not washed up, DH NEVER does them either)
Midnight - DH nudges me and tells me to go to bed, stagger into bed.......
6.30am - Wake up and sort out mayhem of house from evening before.....