invest time in

invest (one's) time in (something)

To put forth effort toward some task or goal. If I invest my time in this project, I want to see some good returns.
See also: invest, time
Farlex Dictionary of Idioms.

invest someone's time in something

Fig. to put one's time, effort, or energy into a project. Mary invests her time in charity work. I invested five weeks of my time building this model ship.
See also: invest, time
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • invest (one's) time in (something)
  • invest
  • (it's) time to run
  • (it's) time to push along
  • (it's) (a)bout time
  • (it's) time to hit the road
  • (it's) time to move along
  • (it's) time to go
  • (it's) time to cruise
  • (it's) time to split