I've let my phone charge overnight.Never had any problem so far.
If the same problem happened just the battery to drain & charge it 100%.
Reboot after that & it should boot.
In your case it's never really a hardware issue because your phone can still boot to bootloader/recovery mode.
Your phone only screwed if it didn't show any boot sign at all.

what i did when i got rlod last time .

i unplug it the charger
hold power button for 30 sec
unhold the power button on plug it the charge.
wait for charging animation
and switch the phone right ?

then charge overnight.