when does a "remain clear" instruction end?

Steven P. McNicoll wrote:

"Teacherjh" wrote in message
...

When did the pilot drop his request?



From an ATC perspective, when he did not respond to the controller's
transmissions.



The pilot said nothing cancelling his request.



No, but when the pilot does not respond what else can the controller
conclude?


You seem to be assuming things that were never part of the stated scenario
- specifically that there were additional controller transmissions to the
pilot and that the pilot did not respond to them. Here was Michael's post
initiating this discussion:

"Consider the following scenario.

You take off outside the Class C and would like to transit it. You are
instructed to remain clear. You circumnavigate it, reach your destination,
and return without landing. You again approach the Class C with the
desire to transit rather than go around. You call up ATC again and they
reply with your tail number but no instructions. Can you go in or not?
I'm positing on the order of an hour or more elapsing between the two
attempts to transit."