|Just wanted to say that we had a barn cat that had about 5 litters before we got her fixed. We never had problems giving away the kittens so we just never got her fixed until after she had that many litters.
Welcome to TCS. It's good you were able to place all her kittens...but I would highly recommend that if you find another pregnant stray cat at your barn, that you have her fixed after her first litter. Shelters are always needing people to adopt the kittens that are dropped off and need homes. So you can always point people looking for kittens to the local shelters.
Thumpity...Good Luck...this is what I found online:
Length of Time for the Total Birth Process
In general, it may take up to six hours for a queen to give birth to all her kittens. The first kitten should arrive within an hour of the start of active labor, and subsequent kittens will take anywhere from 30 to 60 minutes. She will rest for 15 minutes or so between kittens, and during this time she should be allowed to nurse and clean the kittens that have been born. If you have been keeping the kittens in another box, move them back with the mother cat and help them find a nipple. This is also a good time for you to offer her food or a sip of KMR or plain, unflavored yoghurt. Although in rare cases a healthy kitten is born after the seven hour period, you should take the queen and her kittens to the vet for a checkup once seven hours passes and you are sure there are other kittens inside.
Summary of Potential Problems During Labor
Extended Contractions without Birth
More than one hour of strong contractions indicates a veterinary emergency, and your cat should be seen by a vet immediately. Take her and any kittens to your vet.
A retained placenta can cause uterine infection. It is important to count the number of placentas (one per kitten) to keep on top of this potential problem.
Kitten Lodged in the Birth Canal
A kitten that is lodged in the birth canal for more than 10 minutes is in distress, and your intervention may be necessary. Dr. Mike Richards offers instructions for assisting the delivery in an article on his excellent web site. Note that although most kittens are born head first, "breech," or tail-first births occur about 40% of the time, and are considered normal.
Once all the kittens are born, your queen will normally be caring for and feeding them. Make sure she has ample quantities of kitten food and KMR now, and for the rest of the time until the kittens are weaned. And if anything seems amiss with either your queen or the kittens, seek veterinary care immediately.http://cats.about.com/od/reproductio...rthprocess.htm