Totally depends on the weather. When it's like 16 degrees out with a 20mph north wind I'll let it warm up enough to come off the temp peg some. In the summer when it's 103 degrees I'll let it warm up 3-5 minutes. Generally I put my boots (and riding pants if cold enough) on, go start the bike, ride the choke a bit to get the idle around 1,500-1,800 (more so in colder weather), then go finish gearing up. That generally takes a few minutes. I generally have to be in fast traffic within a few minutes of leaving my driveway so a cold bog could get me killed. Because oil pressure and circulation is a function of mechanical clearances in the pump and bearings, extended idling has no effect on wear as long as the choke isn't on very hard.
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