taking FOREVER

Its autometer mechanical
You mentioned in another thread that you're impatient. SLOW DOWN,, take a breath! LOL!
I didn't ask what kind it is, I said to make sure it's accurate! If, by telling me what kind it is, you're saying that it's good because it's an Autometer mech, WRONG! Autometer gauges are right up there on my list of aftermarket stuff that doesn't work right.
Odds are though, that your stat is stuck open, as mentioned, and the coolant can't warm up.