and which sag are you asking for? static sag or driver sag?anyway its driver prefference. if you weight 150 kg you will hardly set a static sag of 5mm while keeping driver sag below 35 mm
if you have your forks and shock serviced already everything is different now so you need to kinda feel it and test how much the forks and shock can travel then adjust accordingly
these are some usual settings by Ohlins
type of bike front back
Super Bike 20-30 mm 5-10 mm
Super Sport 20-30 mm 5-10 mm
RR 250 15-25 mm 0-5 mm
RR125 15-25 mm less than 0 mm*