MinnMan

A few points, though I agree with the post above that everybody is different.

1. Do you really try to ride every day (weather days excepted)? A peppering of rest days, planned or unplanned, are important. I doubt anybody gets more fitness from 7 days of riding than they get from 5. Probably they get less. Recovery is part of fitness.

2. Boredom? Vary things. Don't do the same route every time. Don't ride with the same energy - give yourself easier days and harder days, whether that be speed or distance or route. If this strategy requires some tiring efforts, take the next day off.

3. There is a minimum number of days/week you should exercise to receive a real benefit. That number is something close to 4. For me the sweet spot is 5 days of riding/week and for some it could be 3, though I sort of doubt it. But it's almost certainly not 1 or 2.