Depends on the car, my SD will get at least 6 hours of block heater time if I want it to start tomarrow.

The SDL on the other hand would require me to wait until the GP light goes off then a quick turn of the key.

Depends on the condition.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200