routhly how long does it take a cat to drop her litter?

It's 63 days gestation- 9 weeks.

Unless your cat is oriental, in which case it may extend another 4-6 days.

This is of course only useful if you can pinpoint when she was in season or when she was mated. If not then it's a waiting game.

As for labour times, a first time mum can take hours before her first kitten is born and then have the others anything up to hours apart. One mum at the Shelter had the last of her litter 2 days after she'd delivered the rest of them. More experienced mums may show little or no signs of labour before the kittens make an appearance.

yes it will be her 1st time,after this litter im getting her spayed,with the size off her id say shes only haveing round 3 kittens