1) How many years are needed to get the employee trained/ to train the employee?
2) How long does it take for the employee to get/be trained?
3) How many years does the employee need to get/be trained?
4) What pressure does this reactor operate/work at?
5) This reactor operates at what pressure?
6) What is needed to get this reactor operating/working with no change at all?
7) What is needed to get this reactor operating/working without any change at all?
8) Is it possible to get this reaction completed/finished sooner than 11 a.m.?
9) Will this reaction be completed/finished before/by 11 a.m.?
Note, before and by express different meanings; "before 11" means not at 11; "by 11" means at 11 or before.
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