wild-goose chase 
(wīldgs)
(wīldgs)n.
A futile or protracted pursuit or search.
- time-consuming
- time deposit
- time dilation
- time draft
- timed-release
- time exposure
- time frame
- timeframe
- time-honored
- time immemorial
- timekeeper
- timekeeping
- time-lapse
- timeless
- timelessly
- timelessness
- timeline
- timeliness
- time loan
- time lock
- timely
- time machine
- time note
- time-of-flight mass spectroscopy
- time of life