You buy from?

I plan to get one today.

All bundled together or u need to topup for the freebies?

Use Sony PC Companion and update through your desktop / laptop.

I charge when I'm going to sleep. Normally I charge phone 2 times per day. Evening when I going to sleep and the night time when I going to sleep.

For modern li-ion you can say charge it at any level,  any number of times you wish.
I would suggest you use a timer to disconnect charging overnight if you are concerned about overcharging /overheating phone.  Again this depend on phone internal circuitry control reliability to cutoff charging

I never turn off my charger My usage is

I stop charge the phone at 6am morning and I go school by bus, on bus I listen song

Then 6:40am I reach school and I off the phone (off screen not turn off device)

Till the end of the school day (1:10pm) I check my phone sometime is 90%+ sometime 80%+

Reached Home at 2pm, I go bath and lunch, after finish lunch, I go sleep. That time I never on the phone, so I charge at 80/90%

Night time after dinner, I start play phone, till 10:30 I stop and go charge phone, 70%+
charge till next day morning 6am

Faced it twice ady bro. I'm still on the old firmware.

What's the purpose of having 2 unit? Show off..

Estimate . Not really can tahan 3 days.

Ignore that estimation, it always like that after some usage.

You can return back after clear data at Stamina app, but no point doing so as it will behave same back.

But mine the estimated time change immediately when I on/off stamina.. Tried just now

Your phone must not be rooted to update firmware OTA through PC Companion

Or just wait Malaysia push out, currently as I know only Taiwan and Indonesia pushing out, so need change the build.prop just can update.

Changing build.prop required root.

Shall be coming soon via PC Companion not OTA. I notice Sony is terrible slow or not even do OTA via phone.