I would be in favor of this. Part of the reason that my tournaments run with 24 to accept is my time allotment. It takes me about 30sec per person for an initial invite. It takes about 5 - 10 minutes per person (by the time I double check and cross reference and make sure that its not just game finder screwing up) to issue the 2nd invite. So out of respect for my own life outside of CC, I go with a twenty four hour acceptance.
Now along with that, I post my exceptions policy:
As always, if you suspect there might be a problem, tell me, and in most cases things can be worked out. I am very willing to work around real life if you tell me. I have held games, sent second invites, etc., when I know. Just a short note that says RL has me tied up until Thursday is sufficient. PM, wall, text message, carrier pigeon, something. Just let me know.
I feel this is a reasonable compromise, respecting the fact that we all have lives outside of CC.