[viraptor]

If you have another device to wait a month with, at least you can upgrade to the 2016 line instead of 5x/6p. Gives you another 3 years, not 2.

[robocat]

I think it is 2 years for major updates (from release), 3 years for security updates (from release), or 18 months for security updates from end of life.

Unless you are unlucky enough to get a device that they can't update due to drivers (Texas Instruments CPU).