It's not long but you do need space.
You can also use the large 4x8 insulation sheets - a bit sturdier.Place on the floor and pin your wet quilt (from either wetting in the bathtub or the machine).
Using a lot of carpenter tools (t squares etc), pin it to where you want it, measuring and making sure it's square.
If you have fans, even better. It will dry within 24 hours.
I think Ricky Tims had a video somewhere.
I wish I had blocked the quilt I'm finishing for a friend. But it's a ton of red fabric (that's been a nightmare), and I wasn't washing it on my watch. It's her quilt, she can wash it. :wink:
My LAQ-er does not trim to square. She just trims and blocks to where she wants it to be.