How do i set shutter duration time longer than 5 seconds?

Hi everyone,

i have an SJCAM 6 legend connected to my pixhawk through the PWM cable. The camera triggers but it takes more than 5 seconds to execute the command. i haven’t been able to shorten this time from the camera so i need to use a longer shutter time from mission planner.

The thing is, even if i write 60 or 100 10ths of second in the shutter settings it doesn’t last more than 4-5 seconds which are not enough.

what can I do? is there a parameter somewhere? am I missing something?