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Sorry, forgot they changed at 02 not 03 like everything else. This one has a timing chain. Replacing the crank seal on this vehicle is not difficult, and waiting to change it will not damage the engine. This vehicle has a balancer shaft, but it does not require replacement.
Older vehicles had a balancer shaft that had a seal, along with the cam and crank seals, the balancer shaft seal was replaced as part of the timing belt replacement because the belt has to be removed to do the seals. Labor to replace the crank seal on your car should be about 2 hours.
Unless it is leaking very steadily, like you can watch it drip while the car is running, you have nothing to worry about. Just make sure you keep an eye on your oil level if you take a long trip. And don't let this bother you.