Most of the timing belts i have done on other brands have been 100k km or 10 years, whichever comes first. A lot will depend on if you are doing it yourself or paying a mechanic, and what the plans are for the car long or short term.
If i do them myself the belts come off "looking ok" but id rather have the peace of mind, the other components i personally will/wont replace depending on what my plans are for the car. If it is old and i am just trying to keep it going i wont bother changing everything, and then just deal with any issues as they come up (maybe it starts dripping a bit of oil from a weepy seal so no big deal). If we are planning on keeping the car i will change all the other bits so i don't have to go in there again. I am not familiar with the 2l Hyundai engine, but on my Toyota i replaced the seals and water pump as to get to the pump i would need to take the timing belt off anyway. In the end seals are cheap so why not go the whole hog if you can.
Over here mechanics will only change a timing belt as well as all the ancillaries as that is the only way they can warranty it, but once you are paying the labour for getting to the belt you may as well pay the small extra to do it all.
