"If you spend an hour now, you can save five later." - Rami Hassan

I spent 1 hour in sleeping, didn't save 5 hours of sleep

from my experience it's more like "if you spend 5 hours now, which everyone will complain about, you'll spend an hour less every time you touch this code, but nobody will ever notice that so they'll keep complaining about you always spending 5 hours extra on new features"