...Time is something you always can beg, steal or borrow.
For people in the corporate world, punctuality is an important virtue, but for those who live an artist's life, it is more important to follow inspiration where it leads, and let creativity set its own schedule.
Personal social lives are something in between, requiring the coordination of schedules, but also subject to the internal imperative that says there is a right time to be alone and a right time to open to each individual friend.