Roy, that's a lot of rhubarb. How far along are your seedlings?
I can't really answer your question because this is actually my first year starting rhubarb from seed as well so I have no idea what to expect, except waiting a few years to be able to harvest!
Where are you located? I am in zone 8b ( or 8a), I can never remember, so growing rhubarb is going to be a challenge, but i am determined to find a way!