How can I determine how long of a video I can take on my iPhone 6?

[iMore Question]

how can i determine how long of a video i can take on my iphone 6?

I want to make about a 5-8 minute video but I don't want it to cut off before I finished. How long do I have before that happens?

 

[IAmSixNine]

how much free memory is available on your phone? what size / quality of video are you shooting in?