Joe, Welcome to the forum. My calculation at 120 V would be about 14.7 but + @ 110 Volts it would be ~17+ or so. IMHO it is not too weird. If the voltage is a bit lower, even 109, then it would be longer. There are some charging losses that make the time longer vs. a straight 14.5 KwH calculation.
Yes, 18 hours is in the ballpark if you’re talking about a 2016-2018 Volt, where the kWh Used after fully depleting the battery is ~14.2 kWh.
Approximate charging time can be calculated by dividing the amount of power you need to pull from the wall by the rate you’re pulling it from the wall. Some might say that what you need to pull from the wall (because of charging losses) is ~119% of the kWh Used number.
110 volts x 8 amps = 880 watts per hour from the wall socket. 120 volts x 8 amps = 960 watts.
The Gen 2 window sticker rates the car at 106 MPGe, or 33.7 kWh from the wall for 106 electric miles. At 53 miles/charge, that’s ~16.85 kWh from the wall to fill a fully depleted battery.
Charging at 12 amps is faster, if your wiring will handle the heat that might be produced by the higher current. Charging at 220/240 volts is even faster and slightly more efficient than charging at 110/120 volts because of the shorter charging time.
With the optional 7.2 KWH charging for the 2019 Volt charging the volt at that speed will be even
more efficient. Probably for a 14 KWH useful charge only a 1 KWH loss. With our level 2 Clipper Creek HCH 40 are charging losses for our 2016 Volt is about 2 KWH. A full charge shows 16 KWH into the battery.....
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