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Ir will take about 50% longer than by cable. Not just in the car, but any QI charger takes longer. The car does a decent job though, on a trip it keeps it charged enough that I never have to plug in at night.
I had my Samsung Galaxy S9 in the wireless charging bay for about 2 hours on the drive home from picking it up, and charge speed was pretty decent. The phone charged up from 25-80% or so in that timeframe.