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8 miles sounds bit long.
My diesel car takes that long to warm up to full temp when it is around 20F, but it does not take very long to have some warm coming out, maybe around half mile.
It was not always so, before I replaced thermostat car did not want to warm up to full temp even at summer.
New thermostat made world of difference, here it is common to block most air gaps from front during winter, without doing that air stream cools side of engine so much that car does not reach full temp, even with new thermostat.
With new thermostat and grille blocks I need to put heater to full warmth only below -30F, but of course at those temps it starts to take quite a while to get full operating temperature as diesel motor has lot of mass that takes time to warm up.
Not sure how thermostat is located in your car, but for some cars replacement is really simple job, some kind of repair manual for car would give good idea what kind of job it is, but for my car, I just needed to drain the coolant system, there was valve for that, open three bolts, take old one out, put new one in with new gasket that came with thermostat, refill and bleed the cooling system. Everything was easily accessible, perhaps only thing so in my car, took around 1 hour as I wanted to be very sure of bleeding being successful and I work very slow when temps below freezing.
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