Conventional advice is to NOT pay off more than the required repayments, in the expectation that you won't actually ever repay the whole thing.
Repay nothing for 30 years - by not earning enough to trigger repayment - and the taxpayer will completely forgive the loan.
Seven years ago, Oxford female graduates were being told this very firmly as they were told, by their colleges, that they were statistically unlikely to earn enough money through the course of their careers to actually repay their whole £50k loan before they're fifty. (Gobsmacking, I know, but that is definitely what was being said)
But... if you do earn enough from to repay, it's still a complicated calculation as to whether it's better to repay the loan early, or invest at better than 10% after tax. The exact numbers have varied from year to year because of inflation and bank interest rates