You can have a good understanding of most T&C by just having basic understanding of the law and using common sense. Obviously you’ll miss one thing or another due to not being a specialist. Also, a lot of these contracts have very standard clauses that you can pretty much skip once you realise you read it before. If you’re used to always reading those it’s not really an effort, it takes 10 minutes or less.
Doing it for everything is impossible. Reading it for critical things is fine and needed, but for everything I would need to hire several lawyers.