Yes, you can take enemas daily for a long period, I am thinking of years, but please do not use lemon juice exclusively, switch to salt solution, baking soda solution, soapsuds, etc. All these enemas are for cleansing. Trying coffee retention enemas for odor. Can't be sure they will work but I believe it is worth a try.
My experience with coffee enemas as a deodorant, was after taking garlic enemas for 3 days I smelt pretty bad. But after taking my two coffee enemas in the morning most of my garlic smell did disappear.