Warm Up America Joining Parties

My store has not done this since well before I started working there 3 years ago. I am trying to schedule our first joining party, but I have no idea how long a session I need to schedule. I can't find any guidance on Moogle and no one in the store seems to have any idea either. How long does it take to complete a blanket? I really don't know how many volunteers we will have show up, so I could be working mostly by myself or I could have a dozen volunteers. There doesn't seem to be that much interest from our customers. Since November, we have collected almost enough squares for one blanket and that's all, but there was a basket of squares in the back of the classroom closet which I was finally able to get to which has enough squares for about 3 blankets in it, so I hope to be able to complete 3 to 4 blankets. I did have a customer ask me about the program today, though, so maybe there is more interest that I thought.