Info on revealing lift piston on 941 cat. How complicated time frame.
To identify which option of lift cylinder is fitted to your 941 will require the machine Serial Number. Then we can start to answer your question.
I’m going to say 4 hours for R&R, plus 4 hours for a reseal and rod polish. If you are doing it in the backyard, imma guess 60 hours and a trip to the ER.