Hi I tested this... and it does not seem to work as well as maybe intended, used same Sim to write the same novel pre-hack, it took 8 sim hrs, then without saving my game sent the same sim to write the same novel again with the hack. This time it took 7hrs and 50mins diff being 10mins. If this is the intended gain then great, but I would prefer one that took less time.
Thanks for doing this hack tho, maybe its relative as you say but Im not sure how concidering I used exactly the same sim and tried it a number of times.