Actually you just proved MY point with your numbers. Firstly when talking about the "typical length of a lawsuit" - settled cases aren't part of the maths AT ALL - they didn't complete the lawsuit. The time for ones with actual verdicts, that set precedents, that's the time that matters.

Now as for the prevalence of settlements - that 90% of cases are settled PROVES how badly the system is biassed in favor of big corporations. If you pursue a case against a company that wants to fight it out - you'll be out hundreds of thousands of dollars (even if your lawyer works on contingency there are costs) - with no guarantee of success, and it could take years or decades.

And this is why pretty much every lawyer advises almost every client to take any settlement they can get. So corps can just pay off claimants with a token fee - and avoid precedent against them. People take settlements so often EXACTLY because lawsuits are almost impossible to win.
A settlement is NOT a victory.