4 hours is too long and also unnecesary.
2 hours would do just fine.
I also think 1 is actually enough to make a point.
There could be a line to say that keeps people from engaging into the same fight, in case it is still going on (only happens with base sieges anyway).
"You cannot enter the same fight (e.g. a base siege) that you died in."
And yes, it would definitely reduce the QQ about being killed in pvp, which would be a good development on the server. As a consequence of reduced QQ, frustration and anger, there would be less sanctions, less oorp bullying and hostility...
