Eh??? I did forks on my CBR600RR recently:
1. installed 0,85kg/mm springs, slightly lighter than stock
2. new oil and dust seals
Took all of 45-minutes. About 30-min to get bodywork off and back on. I did use power-tools to unzip allen-head bolt at bottom of forks initially. Saves tonne of time compared to doing it later with no spring-tension on bolt. I recall similar process for 250 forks when I did them couple years ago just before selling bike.
But 5-6 hours? Nah, they're scamming you! For 1st-time non-mechanic doing this, following step-by-step in manual, 2-hours max!