As far as you want. Japanese quilts are made by this method all of the time.The largest I have done is double.

Is there a tutorial on qayg. I am not sure how to put it all together.

I am presently doing a queen size qayg. Love doing it.

as far as a tutorial....Ditter has one....just "search" for it in the box above

For the QAYG I made, the back is in one piece. I will try to find the directions. This was a class I took 2 years ago.

I made one that was about 62" x 77.5". It's the one in my avatar.

I've done several and am now working on the group sew along, Affairs of the Heart which is also being done QAYG.

Here's a sample of mine

I have made four King-Size and one crib-size on one of my regular Brother machines..............works great, just keep the bulk of the project to the left as you work.
One has a Blue Ribbon from the County Fair.......My kids entered it without me knowing.
I bought the Fun & Done templet and discovered that I could do the concept on a much larger basis. I designed all of the on graph paper and went "to town".
Katrina

My first quilt was done in horizontal strips and then joined. The front was joined by machine and the batting and backing by hand on my kitchen counter. It is 80" x 100."

I don't think I'll ever do that again.

I've used the Fun & Done method for a king size quilt. It certainly makes it easy to quilt and it's quite fast, too.

I am just finishing a king size quilt as you go.