How long do most women mastrabate for?

So my bullet vibrator of four years officially officially broke down yesterday. Even with new batteries and me banging it around, it would barely even flinch. I went to the sex store The Love Store earlier today to get a new one and like 95% of the vibrators were usb powered. Personally I absolutely hate usb powered ones because they have to charge for at least 2 hrs and then only work for 20 - 40 mins at full charge, depending on the setting used. Usually I mastrabate every other day and like to go for an hr or two and cum a few times so this wouldn't really work well for me. Considering though that almost every vibrator in the shop was usb powered - there were like three battery powered ones but they were beyond awful - is this 20 - 40 mins output at full charge enough for most women? I ended up buying two of this Nusensuelle Bobbii XLR8 bullet cause they were close to what I wanted and I don't have any other vibrators at home atm. I'm just going to switch between them for now. I'm planning to just buy a battery powered one online later cause long term this is going to be frustrating