What is the maximum time value between 200 OK and ACK?

In case if it exceeds 4-5 seconds upon re-invite session, i have one-way audio (the caller cannot hear the callee) and such message appears:

[Mar 24 17:21:26] WARNING[1433] chan_sip.c: Timeout on 254ecbd9644f670d189eb59478444785@ on non-critical invite transaction.

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