HI Gasff,
I run a phantom 1 with Zenmuse, gopro and FPV transmitter.
Out of the box I was getting up to 8 minute flight times.
I swapped to Vision props (genuine DJI ones) and this went up to 10 minutes.
I then went to a Dinogy 2800mah battery (fits snugly without mods) and can now get 12 minutes, landing as the first red LEDS light up.