Learning your times tables is important. Keeping them fresh in a child’s memory is another.
Like 10 minutes of reading every day is essential for basic literacy, so is daily practice number facts essential for numeracy; yes 10 minutes every day, just like practicing scales on the piano before a lesson.
So often students are taught the basic facts in a few sessions, then they are left to themselves. Students need to be practicing number facts every day so that they never forget them even when older.
It is so common in older grade levels for teachers to have to teach number facts again rather than progressing on to higher level thinking such as fraction work or percentages. If students came to them with a fluency in number then their task is so much easier. And having students being fluent in all mental skills is the goal of all teachers pulling together as a team.