how long a delay between a request to comply with a license and compliance
It's not a request to comply with a license; it's a request for source code. It's a condition of the license under which people copy/distribute this code that they supply source code to anyone who requests it.
BTW, note that the proposed wording is essentially a suggestion. The author knows that Linus can't specify a time limit without losing his own license to distribute this code (because he would be adding restrictions).
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