You're probably fairly safe to relax on the idea that this is a major
problem or a warning that you're about to have a timing belt problem.
It's much more likely that this is an ignition, sensor, or fuel delivery
Additionally, timing belts tend to fail suddenly with no advance warning.
With either of the engines available in the Tucson, there's a near zero
probability that the belt will fail prior to the replacement interval.
The extended crank is often caused by a fuel pressure regulator which
dissipates all the fuel pressure when the vehicle is off. But this rarely
causes a stumbling once started. It's also possible that the issue was an
incorrect fuel mixture due to erroneous coolant temperature sensor
readings. And it's possible that there's a spark plug, plug wire, or
ignition coil issue.
You might stop by AutoZone or similar place just to see if any codes
stored but did not turn on the check engine lamp. If so, this may provide
further hints as to what the issue was.
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