On January 13 2017, I repotted these. The bottom half of the planter is soil which should give them about another 8 months to year in this planter. 

I water these succulent plants every 5-7 days. This collection in an 8 inch diameter terra cotta planter contains a peperomia golden gate (more yellow and green than in the photo!), black gem aloe (about half the size of a mature one), and a dogtail cactus. (The last photo is of the same main plant taken yesterday in a smaller planter; the green came out better in that photo so I am including it here.)