是waste time doing，为固定搭配，中文意思是浪费时间做……
1、When one hurries too much， one is likely to do a poor job and have to waste time doing it over.
人匆忙做事时，可能做不好，还要浪费时间重做。
2、
Identify what you waste time doing and eliminate it.
看看是什么在浪费你的时间，然后把它给消灭掉。
3、
We don't waste time doing 3-D models and design work for products that will never exist.
我们不会浪费时间做3D模型或设计与生产永不会存在的产品。
waste是及物动词，后面可以直接跟宾语，当然宾语后面可以加宾语补足语，例如waste time to do sth， time是宾语，to do something是宾补，也可以是waste sth on sth或者waste somehting on doing sth。因为waste是及物动词，所以不能直接说waste to do sth，应该是waste sth to do sth。至于waste doing sth，也没听说过这个用法，最好是waste sth on doing sth
