Santa Fe,timing belt and driving belt replacement interval

I bought an used santa fe 2002. I found the previous owner changed timing belt at 113,000 miles in 2013.(sticker placed inside the hood). Now the mileage is 142000. I do not do sudden acceleration and try to maintain rpm below 3,000 as much as possible. even when i accelerate, i just press it lightly, like senior citizens. I checked the drive belt (the belt seen outside with several pullies and wheels), it seems to be in good condition (no cracking, no faded portions). I am wondering when should I go for timing belt?, I mean at what mileage should my next timing belt be installed? and what ab