I'm in the pay bracket requiring annual self assessment and 10 minutes is probably too generous, purely because you log in to your SA account and the PAYE section from your employer is already pre-filled. You don't need to look at your pay slips, HMRC already has all the info from your employer and literally all you need to do is have a cursory glance whether the numbers look right then click confirm few times and submit at the end.
Obviously very different if you're self employed or have income mostly from investments or properties, but the you have an accountant to do it for you.