Bloody bloody bleeding brakes !!!

[Peter-C]

A couple of questions on brake bleeding.

How long is a long session ? Is it 10 Minutes, 20, 30 ?

Do you have to every tiniest bubble in the world out.

I'm asking because I'm getting absolutely nowhere. The brakes hardly work at all and the the pedals as spongy as buggery.

Am I doing it right, start at the rear nearside, undo the nipple 1/4 turn , press down pedal and then tighten up and release pedal moving on to rear offside, front near, front off. I've removed the brake pressure sensor and pumped brakes. Stll no change.

Any ideas please ?

Cheers

Peter