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If the thermostat is good, and the manifold pre-heater is working (the tube from exhaust manifold to air cleaner) along with the flapper valve, then typically it will reach operating temperature within about 3 miles when it's about 20F or so. As much as 4 miles if sub-zero, and about 2 to 2 1/2 miles if about 40F or warmer.
How many miles does it take for you? Turning on the heat or defroster before it reaches the warm mark will delay warmup more.
How many miles does it take for you? Turning on the heat or defroster before it reaches the warm mark will delay warmup more.