If you have more than an hour's work,give yourself a break after an hour. on the other hand, don't break it up so much that you can't get anything done and you should be able to work at least a half at a time without stopping.
上半段,楼上都对了 最后一句, LZ 应该是写错了 you should be able to work at least a half at a time without stopping. 应该是 you should be able to work at least an hour at a time without stopping. 你应该可以一次过工作一个小时才休息