If you want "no notice in notice, hostile, war, pw" then you specify it. Many or even most cf deals these days do indeed specify it, but they don't all specify it. If the deal doesn't specify it, then the other party can notice you whenever they want (after any duration specified). You don't assume restrictions are there if they aren't specified. Likewise, most cf deals these days specify a notice duration to end the but not all do. If no notice is specified you don't assume it is there and expect to give notice after the duration is up.