what is the normal mileage for replacing the timing belt and what other parts need to be replaced with it

don't know!no engine size included in the question.see owners manual.

If your 2010 Kia Soul is equipped with 2.0L engine, the timing belt interval would be @60,000 miles or 48 months. The water pump is driven by and is behind the timing belt - and we recommend that it be replaced at the same time. Other possibilities include the timing belt tensioner and idler pulley. If you haven't replaced your drive belt and/or upper and lower radiator hoses, this might be a good time to consider those as well. It all depends on whats been done, and the condition of what's on there now. The 2010 Soul was also offered with a 1.6L, which is shown in our labor guide as using a timing chain. Timing chains aren't changed on a regular basis or maintenance interval. In fact, unless they become noisy and cause concern over their reliablity, they'll never be changed. Either way, the timing belt or chain keeps the top half of the engine working in "time" with the bottom half of the engine. If one fails, it can cause catastrophic engine damage. If you're unsure if or when this critical maintenance was performed it may be wise to err on the side of caution and get it done as soon as possible. We actually have a Honda here now that a client bought (used) for her son to take to college; it's timing belt broke the first week they had it, and now it needs a new engine. Hope this answers your question.