Mine does not stay at 180 it cools all the way down. I know this because I pulled the tips off manually. (plus it has a read out for the temperature)
All I'm saying is that when you compare two Irons for re-heating time, you should be fair & compare Apples-to-Apples, and take into account each starting Sleep mode T.
Is your Hakko starting Sleep T 24c ? 100c ? 180c ?
What Sleep T is your JBS configured to ?
These kind of things.