If the iron isnt in your hand, then it should have a decent sized blob of solder on the tip, hot or cold. If you have a lot of solder on the tip while its hot, then the solder will oxidize instead of the tip, so you can easily wipe it away, add a small amount of solder to tin the iron to do your joint, wipe it to get any crud from the pcb off, re-tin it with the blob and put it back in the holder. Turn it off/unplug it, let it cool with the blob on there, and its still there when you turn it back on.