It kind of depends on how often the tractor sits at idle. If it is 2-3 times every day my best estimate is 5 min. is plenty. If it once a month 15 min. probabily would not hurt anything.
The main thing is to ensure the engine is at operating temperature. Depending on your electrical load you may be using more current than the alternator (more of a problem with generators) is producing. This could lead to hard starting, short battery life, etc.
Don't forget your hour meter is still running at idle and they add up fast resulting in more frequent oil changes and reduced trade-in value.
You are of course burning fuel during extended idle periods.
Your owners manual will also have recommendations.
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