For Example: If habit of yoga is something you struggled to bring as a habit. Then go for 1 minute yoga for 7 days.
Later once the 7 days are up and if you haven’t missed a single day then go for 5 min x 7 days and keep doubling the duration every 7 days until you reach your goal.
Consistency > duration > quality
As adults it is more difficult to introduce new habits and keep at it. So best way is the 1 min habit and aim for zero missing or skip days during the habit formation period – i.e. minute of 3 months!