People get confused by thinking that the 10 (or 5) minute limit for TOGA applies only at absolute TOGA thrust but it's actually anything from TOGA down to MCT/Climb thrust
NB---
Anything above climb thrust, which can be considered max continuous during the climb phase (MCT is a variable limit depending on conditions) is limited to whatever the manual says for TOGA.
The Airbus detents confuse the issue slightly because you see a seperate positions for FLEX and CLIMB/MCT when often they achieve the same thrust - no thrust change at acceleration alt etc.
FLEX can never be below climb thust (due to performance requirements) therefore you are always in the (TOGA) limit region during takeoff.....Hence the stop watch start!