In this situation I would do it in sections and chain piece. Depending on your own personal style of working you can do them all or if you are like me I like to see the progress, so I would do perhaps 20, 20 and 20. I seldom get the opportunity to sit down and work for a full day or two and I just want to see some finished blocks on my "wall" so I would do 20. This also lets me know if I have made errors in sewing or heaven forbid cutting!