Three times a day if there is someone here at lunch time and depending on the weather, if it's too hot at lunch time I don't take him.
Depending on the route, it's usually 30 - 45 minutes each time, some times even longer.

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The pups (1 Year) go for a lead walk in the mornings for 10/15 mins, then again at about 5pm for about 30/40mins, on the wkend and about 2/3 times a week we go over the countryside for a run in the fields, Billy (nearly 10) 15/20 mins a day, as hes tired and has bad joints, but he goes to work with OH most days for a couple of hours (he has a gf in the office lol!)

bailey goes out for walks 3/4 times a day lasting anywhere between 15mins to an hour or so depending on where we walk to. when he is on holiday with my parents at the caravan he goes for several looooong walks of a few hours. he is not really that bothered how long his walks are, as long as he definetely gets out at least 3times.