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How long will marshmallow be ok to use?

Still using Kit-Kat here, so I wouldn't worry about it too much.
Over time specific apps may stop supporting older OS versions so it may depend on which ones you use, but it will probably be a long time before your MM device becomes unusable.
 
One third of Android users worldwide are still using Android 6.0, Marshmallow... followed by Android 5.1, Lollipop for a fifth and Android 4.4, KitKat for about 15%. So, good for as long as your hardware will support apps that are built and configured for later Android releases and increased RAM usage, as psionandy states. However, you will no longer receive Google Security updates which could leave you vulnerable to attack which is why a lot of users choose to install custom ROM's such as Lineage on Android 7.1.2, Nougat which are currently running Google Security patch for 05 JAN: 2018. My old Galaxy S2 and S5 have a new lease of life because of this.
 
My tablet is still on marshamllow, I just use it to play games and browsing so I can still see it serving for another year or two. My daily is on nougat but my backup phone is on kitkat and its still serviceable(I mean kitkat is optimized as hell, the phone is 3 or 4 years old already and can still post an 8hr SoT with its 4000mah battery lol).
 
https://developer.android.com/about/dashboards/index.html

Something to keep in mind is even though having a phone that is still receiving security updates is better than having one that is not, while that does of course make your phone safer it's still a matter where your phone isn't necessarily safe.
Exploits that have been revealed are simply the ones that have been discovered and made public, there's a 100% chance there are dozens more that are yet to be exposed. When the news media makes a big deal about some vulnerability that was 'discovered', most of the time it's a matter where the problem is actually several weeks or months old, or in some cases a long-standing, years old issue (i.e. Spectre/Meltdown).
So if your phone is still getting updated, enjoy the benefit of that, but don't assume that simply because you've got the latest security patch that means your phone is now secure and immune. An older, non-supported phone might not be receiving security updates nor version upgrades any more but that alone is not necessarily a valid reason to write it off as unusable any more.
 
im still on marshmallow revisiting my htc one m8 : - | i missed the front speakers : - | for the most part it still performs well while on high performance mode : - | as usual of course that means the battery drains in no time : - |
 
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