5 toons, about 10 days, so around 55 summons using my DK + 4 Ret Pallys

5 of each ring (set to each toon)
4 swords (to the Pallys in case they go Prot at some time)
4 helms (to the Pallys again)
1 Squashling (to the DK)
1 Mount (to the DK)