How long till they show?

How long is is usually from breeding till a mouse is noticable pregnant when held up by the tail. I have a few showing, and i was curious how far along they probably are. Not that it really matters all that much, but im anxiously looking forward to not having to buy feeders (very often anyway). I can post some pics later if it would help any.

My experience with mice is that they show right before they deliver usually..

I bought 3 mice from a pet shop almost 2 weeks ago, all came here pregnant, without me knowing, and since, 1 has delivered.

Well im sure most of these aren't very close to delivering delivering. Ive dealt with quite a few at that far along when i was cleaning cages for the schools mice and they looked like a balloon. The ones im asking about dont show (other than one of them) while on the ground, but if you pick them up by the tail you can tell.

The mice look like they swallowed a golf ball a day or so before they deliver....