If, as Laundress points out, Euro FL washer take as long as American FL washers to complete cycles, then the American 110 volt standard is not the issue.
In fact, most modern American 110 volt FL washers do not halt the timer in order to heat water. Instead they just limit the time of heating to a maximum of about 30 minutes, and continue tumbling during heating. Except, of course, for Sanitary cycles where the temp must reach over about 150F to earn that dubious distinction.
I do not mind that my Neptune takes 109 minutes for the longest possible cycle (extra heavy wash 34 min, plus a 15 min pre-soak, plus the maximum rinses (4), plus max extract 9 mins). Most cycles with 4 rinses take about 59 minutes. My laundry closet is in my main living area - I can cook, work on the computer, watch TV, etc while the laundry is going and it doesn't really tie up my day at home. I can also set the machine to start in the morning before I go to work and then be back at lunch to hang the laundry up to dry (providing it ever stops raining in Northern California). The spotless results with the 109 minute hot boosted wash makes it all worthwhile.
Of course, the Neptune tends to use more water - in some cases twice as much - as later American front loaders (25 gal per load average). I'm not claiming this makes it any better than newer FL's, but the Neptune is still the best fit for my laundry closet.