It is as I expected. Once you summon him, you can't summon him again, even on a community lot, I guess I will have to put another sim in my household and kill them and see if that works. I suspect that will not count as part of the quests though. I'll report back.
I've already summoned Grim Reaper twice at home, using the same Grimophone, and the command is available to summon him a third time. The command did disappear while Grim was in the neighborhood. It reappeared but was greyed out for a long time after he left. Apparently, there's a cooldown and I think it's probably 24 hours by the game clock.
I also summoned Grim to the Willow Creek Archives, as I stated above. It's impolite to imply that I'm a liar.
