Screen timeout

Hi all

I use my watch for cycling. 

I have my phone on the handlebars so that I can monitor my heartrate as I ride. 

I have an android phone where the max time it allows before the screen locks is 10 mins and I can't disable it as far as I know. 

It's a right pain having to stop, take my gloves off and reopen the phone every 10 mins. 

My old phone had a 30 min timeout option. 

Aby ideas ?