Talk:Monsarno Research/@comment-819174-20150418152317/@comment-167.61.245.222-20150418175807

For fertilizer, level 1 8h for 9, level 3 4h for 5, level 5 2h for 3.

For corn, level 2 16h for 9, level 4 8h for 5, level 6 4 h for 3.

At level 7 there are no new jobs but an increase on the amount of the job rewards for fertilizer.

Another user stated that (s)he couldn't upgrade the level beyond 7 before act 2.

Hope it helps. :)