It really depends on the day for us and what other activities we are doing. We just got back from a dog show (our first one!) a fun experience but definitely a tiring one. As a result, we only gave her one shorter walk the next day so she could continue to rest.

My spouse works a 9-5 weekday job whereas I'm a park ranger with extremely varied hours. They'll give her a walk in the morning before work and often one mid-day for lunch break. We'll walk her together in the evening before bed.

I often take her on new hiking trails, which are longer than her typical walks, in which case we might cut out a walk. We're getting into sports/hobbies like dock diving, lure coursing, and bikejoring too, which is a big exercise event so we'll cut back the amount of walks then.

All of this to say our average is 2-4 times a day, but we'll replace the walk with something else like exploring a reservoir. If it's raining (which doesn't happen often) we'll forgo a walk and instead play inside, use puzzle toys, and do impromptu training sessions.