Thank you both for your replies.
There is nothing about it in my ops manual. I am not planned to operate an aircraft (positioning, sim duty and again positioning) but I can't find any info on the "max ground duty time" / day. The positioning is considered as a ground duty for the company, as is the sim session and the positioning flight to the home base. The only thing I found says that I am limited to 60 duty hours in any 7 consecutive days or 110 duty hours in any 14 consecutive day,...but nothing about the limit for 1 single day.
I am trying to find a legal answer as 16h25 of duty on one day seems to be too much to me.
Thank you again for your help guys