But 6/7 days seems like it should be max. You can exercise every day but if the intention is to exercise intensely every day = Always a day that you won't no matter what. So if you shouldn't feel discouraged for missing a day.

People walk and such every day but then get out of the habit and say "I should start doing that again". If intention is 2-3/7 days (Like me), it fits into the schedule. So for a few years I've been doing that..