How often indoor succulents need to be watered depends on the type of climate you're growing the indoor succulents in.
In drier climates indoor and outdoor succulents need watered every 5 to 7 days but in more humid climates you can get by with watering the succulents every other week.
However if you do notice any dying or problems with the succulents then you need to water them more often.
I would water the indoor succulents every few days for awhile especially in the beginning and then you can water them less often.
Make sure the succulents are in pots that have drain holes and as you water them the excess water will drain out which means the succulents are getting enough water.