Anyone managed to get anything close to the reported 21 day standby time?

WOW, Excellent, so what am I doing wrong? What can I check?
My mobile network seems to stay on all the time and so does wifi, even though I have told it to turn wifi off during sleep
When I look at power usage it says Phone Idle is the main user of power, so the phone seems to be going into idle mode???

Familiarize yourself with the term "Wakelocks" and how to fight them.

I use Greenify, PowerNap, Autostarts etc. on my phones. Wakelocks are an Android problem (i.e. it's not the fault of Blackview if you install many apps that use receivers and eat your battery). Android 7 tries to solve the problem.

Thanks I'll look into it, good thing that it is possible