So you struggle to remember there are 60 seconds in a minute, 60 minutes in an hour, and 24 hours in a day? Again, having never seen a metric clock in my life, I assumed people could remember imperial identities or at the very least look them up if they cared.
Imperial evolved over centuries to contain units people actually use. I do not expect it to be used in science, Metric has its purpose. However, units that vary when it matters have value.