Tnx all!
720, yes... its mind-boggling, but seeing as I managed to make 120 in 1 weeks time (normal week, with 32 hours of work and familiy-time to add), it makes me think I can really do this in a few weeks time. The joining really takes time and is a tedious job. But it has to be done. Joining the rows is fun, cause you can see your progress instantly... joining the columns later is less fun but has to be done. So i'm trying to do that now in between making new squares, for the 6 rows I've done now...
I;m joining by the methodes of Lucy/Attic24:
http://attic24.typepad.com/weblog/joini ... aures.html It's relativly quick and easy to do... except when you are trying to join black squares at nighttime

So i'll save that for daytime...
Luckily, I found out this weekend I can do 1 square in less than 4 minutes and my daughter (2,5y) loves to cut the thread at the end of a squares, so she now request me crocheting and helping me

Oh and the squares are about 3-4cm (1-1,5 inch) big when not joined... when I join them, the shrink a little. I'll try and measure the work tonight as to get an idea of how big it will be in the end.