I do not want to waste any time. And if you are not working on important things, you are wasting time.
thetimes time
Most of the time you will fail, but you will also occasionally succeed. Those occasional successes make all the hard work and sacrifice worthwhile.
thetimes time work
My biggest worry is I'm running out of time and energy. Thirty years ago I thought 10 years was a really long time.
thetimes time worry