It only works for the low / worst quality setting, I think you need a account for the higher quality stream to bypass the 30 second limit, at least you don't get the constant annoying flash adds they have on the website though slowing your browser down to a halt
You can make your filmon script shorter though you only need the the filmon webpage channel url
eg:
livestreamer
https://www.filmon.com/channel/bbc-news worst
pause