Specifying a summoning ritual, especially one for invocations. Pg. 181 "During the time a character prepares an Invocation, he concentrates and synchronizes with it, so it is possible to use as a Passive Action." I assume this is referring to the ritual. Which is nice for summoners, for at least 5 turns of passive ritual to get a +0 to summon/control/bind.
The real question though, is, if it is passive, or even if it isn't, can a person just have a "daily hour ritual" for a +20 to using his invocation in a day? I don't see any reason you couldn't really, it doesn't specify much, and "other, simpler Rituals just need chants or gestures". Would it be too incredible to allow people this? If it doesn't work like this, how do people realistically pull of "more than fifty year" rituals? Do they need to specify ahead of time, and they can never push the ritual ahead of time?
Thoughts, comments, concerns, rude remarks? If a psychic can concentrate with "passive concentration" forever, is it too crazy to allow a summoner something like this?