There are quite a lot of places where Harry thinks about the 6-hour restriction, which is what limits use a of Time-Turner after already having used one. There are places where it’s an important plot element. Are you trying to find a particular scene you only remember bits of?
Does anyone remember an event from the whole book when Harry thought about Turning Time while already being in past.
Could you be more specific?
There are quite a lot of places where Harry thinks about the 6-hour restriction, which is what limits use a of Time-Turner after already having used one. There are places where it’s an important plot element. Are you trying to find a particular scene you only remember bits of?