How often should the female be mated?

Question
If we are trying to go for a larger litter size Only because she is 17pounds trying to make less stress how often should we let male and female tie? Should I leave her at the studs home untill she stops being receptive?? Thank you for all your help in ther past. If we are driving how often should we meet? The stud lives 2 hours away..  Thank you

Answer
Hi Again:  You need to ask the welping and breeding experts... You are getting over my head...Sorry, I just know the basics on this.
Here is the link for the welping people...
Good Luck!!

http://www.allexperts.com/ep/3634-76365/Dog-Breeding-Whelping/Joyce-Crierie.htm