I have four two week old yorkie poo puppies and ones eyes are open a crack and I was wondering how long till it's fully open once it's starter to open?

It is usually only a couple of days. =)

Whats with all the BYB all of a sudden (today I mean, those reatures are always out there) Don't you think you should have found out things like this prior to breeding more mixed breed puppies?
between 2 and 3 weeks. I am sure your vet. You know the one that has already seen the puppies and mom could tell you this too!

A question asked by some unreputable backyard greeder. There is NO such thing as a Yorkie-Poo, or any type of POO dog. Nice that you've added to the over population of dogs. CONGRATS. Certainly the pups have been to the vet's?

puppies start to open their eyes at around two weeks

tons of experience with dogs and puppies

a day or two. usually they open between two to three weeks.

^