I din't read all the replies, so I am sorry if this is a repeat. If you want to quilt for a longer time, try setting a timer. If you can make yourself sit for a half hour to begin with then set your timer to that time frame. Next time, add five more minutes. The next time add an additional five minutes. When you reach 45 minutes, stay at that for a few days then start increasing again. If your "two or three blocks" take more time than the half hour then start where you are comfortable and add time from there. Or just resign upirself that you need breaks and set a designated time when you will return to your sewing.