My wife tells me it takes her 8 minutes to dry her long hair with her 1500w drier on high, she washes it every 2-3 days. Using Jons numbers that's 16.7A every 2-3 days. With the surge involved you'd probably need a 2000w inverter, but that's just a guess. Don't know what the low setting uses. The hair dryer makes our 2000w generator kick into high gear.