The phrase "painstaking effort" means putting in a lot of time, care, and attention to complete a task or achieve a goal.
Sentences with «painstaking effort»
I guess I was afraid of migrating and losing my contents or painstaking effort of redoing my layout. (rolalaloves.com)
The people we are dealing with take painstaking efforts to perfect the fraud. (punchng.com)
As a consequence — and despite painstaking efforts by today's architects of «common core» standards — there is not yet a firm consensus for moving in this direction. (nationalaffairs.com)