In descriptions of daily routine, when the actionA general term expressing that somebody or something does something begins before a specific point of timeA particular moment in time. E.g.: She came home at six. ("six") I was born in 1980. ("1980") (, which is not necessarily the time of speakingA point of time at which an utterance is made.) and probably finishes after it, the present continuousThe aspect expressing duration, formed with be + verb-ing. E.g.: What are you doing? tenseA grammatical category that is marked by verb inflection. To express when an event or action happens in time or when a state exists, we use tenses. is used. This point is expressed with a time expressionA word or group of words used in a particular situation. E.g.: Good morning, at six, on the sofa or a simple present clauseA group of related words containing a subject and a verb..

At six I'm walking the dog.
Whenever I get home, my dog is sleeping in the armchair.

If not a specific point but a specific period is implied, it can be expressed with a time expression or a clause in the present continuous.

I'm walking between 5 and 6.
While I'm walking the dog, my wife is cooking dinner.

Present continuous for temporary present habits
Present continuous Present perfect