How long do they last
1490636
A long time, I would think, but I must admit I have quit using mine. It actually seemed to increase the mask leakage. I think the edges are too thick (the thickness seems rather uniform & I think it would be better if the was more tapered towards the edges). I've gone back to using band aids. I just put lotion on the bridge of my nose before applying the band aid, which allows for easier removal the next morning.
1490637
I cannot answer that because I was never able to get it to fit with a good enough seal to wear it longer than 15 minutes. I hope that is helpful. I did change mask styles which helped some and I wear the mad just a little looser; seems crazy, but it helped, some.
2141242
First time they last for about 2 months. After that when u add water, it doesn't last for that long, mayb a month or so and the time keeps decreasing subsequently
1884376
Mine have burned 5 hours every night since I got them. Probably two months already. They are great!!!!
1110824
Depends if you purchased New or Old or Refurbished or so. They do last 3-5 years depending on how well they are looked after.
1752837
Mine are fairly new (a few months old), and they're still perfect. With decent care, I figure they'd probably last a year or more with daily use. But I don't really know--this is my first set.
1108353
I'm sure they would last beyond a year. I've had mine for maybe 6-8 months and some have changed shape a little, but otherwise they are all perfectly fine!
417654
don't know. When I buy them they are usually good for 6 to 12 months or longer.
1603061
I truthfully do not know. I do know that I do not change mine every 6 months. I would think that they last a long time as I have not seen any date on them.
2038343
They last about 2 days for our dog. We used to get the small, but they were gone in an hour or so.
1390286
They last pretty long. Make sure you use quality batteries, like Duracell or Energizer. Don't forget to turn them off when not in use. I don't want to attempt to guesstimate how many hours, but we really don't have to change them often. If they start making funny noises, time to change batteries.
407672
These are "rechargeable". Simple Human recommends that you put them in direct sunlight for 3 hours, once every 4-6 weeks to recharge them. By doing this they will last longer, and you can probably get up to one year out of this two pack.
372037
I assume your hearing aids were designe dto take these batteries. If so, the will last approx 22 on a charge to begin with deppending on how strong the aids are. Then as all recharable batteries do, they will start to last less and less. When they do not last all day you should look at replacing these. They generally will last about a year but I seen them last between 6 months and 18 months depending on the number of hours you use them a day.
159303
Haven't let them go fully dead. I normally recharge every 15-16 hours. They always last from one charge to the next. No problems with life.
2087832
most last about 10hrs...however there are some that I've bought that were still hot the next morning..(activate at 8am and still warm next day same time)I only need them to last an 8 hr shift at work...I have arthritis in my hands & wrists and these help with the pain of keying on a computer all day...I use them in fingerless "gloves" as far as shelf life I buy a large box & use them 5 days a week..so I dont keep them for months...they do not activate until opened ...
614650
i only had mine for about 6 months, i guess the work till the lights go out. they seem sturdy so i figure a couple of years. i swear by this product. a neighbor still has bugs and i havent seen any in months. well worth buying.
2266278
Im not exactly sure but its not that long. I bought them for my kids and if i had to guess I'd say mabe 4-5 hours.
469153
They last a long time, atleast over a year. Be careful not to drop them because they will break on a concrete floor pretty easily! That is the only reason I have had to buy more.