I refuse to cover these anymore. 4 X 20 mins is correct.
My issue is, out of a league of 11 teams, 3 are not registered on the WGS. I only discovered this after my first first at the beginning of the season and I'd issued 4 YCs.
Can't put the match on the WGS as the club concerned isn't listed. Spoke to local RA, advised contact county FA which I did. They pointed me in the direction of the FA, they've pointed me elsewhere with no real answer.
Spoke to the person listed as the referee appointment officer for the league who wouldn't speak on the phone and just told me all cautions go on the WGS with no real interest on explaining why some teams aren't listed there.
There's a danger it becomes a bit of a free for all if the cautions cannot go through. That's my experience unfortunately.