My walking varies according to weather, where I am and workload (the three w's!).
Both of mine can survive on 30 mins every other day, if necessary - as it was when I had the flu (they were so understanding). Normally, winter is at least an hour weekdays and longer at weekends, but longer if I am in Teesdale. Summer is two hours a day +, sometimes all day.
Pip, despite or perhaps because being, an outside dog tied to a chain before he was rescued, does not like wet weather and would not even go out into the garden when the weather got wet and cold . He's got better in the last few weeks - he now knows he won't ever be left out there.
Pip is on a lead on walks, but in Teesdale, is off lead in a secure field. He gets much more exercise there in 10 mins than hours on lead.
Fletch is half working, off lead unless on a road, and needs so much more exercise and stimulation than Pip. With Fletch, ball throwing and looking for the ball is a must on a walk. He also needs plenty of stimulation in the house looking for toys.
My parents' bitch strolls over to the edge of the field, has a wee and comes back home. She is younger than mine (she is 5) and is by far the most laziest cocker I have ever known!
Every cocker is different