I've tried starting a response three times and keep deleting. Man.. put some yeast in, ya a couple table spoons . The yeast are going to grow. How long it takes them you'll have to find out by waiting.. But when it' ready, if you have any experience in baking bread, you'll know by it's siZe the dough is ready for a punch down re-knead and set before making into a loaf.
Reading what I wrote I probably sound like an a$$. But seriously, give it a shot.
Yeast are pretty darn tough whether they are bread yeast or beer yeast. Just treat them well, let them enjoy a nice temp to do their thing in and give them time.
When brewing beer or bread making the yeast need to be taken care of. They do all the work.