If you explain it means "depois de tantos acontecimentos", one who is learning Portuguese as a foreign language may come up with "a essa altura do campeonato o povo acaba/acabou ficando anestesiado" or, worse, "a essa altura do campeonato eu nem vou trabalhar amanhã". Then again, if you say it means "tarde demais", you may hear them say something like "Eu cheguei a essa altura do campeonato" or "Encontrar às 11 da noite? Para mim é a essa altura do campeonato."
To explain that "a essa altura do campeonato" means "depois de tantos acontecimentos" or "tarde demais" is an easy task. However, how can we explain its usage?
EDIT In addition to definition and examples, the answer I'm looking for should explain usage. Something like "use it if the context is such..." and "don't use it if the context simply..."
EDIT II Not everyone seems to understand what I'm looking for. The answer to my question must include definition of "a essa altura do campeonato", example sentences and. most important, why one uses it, what's the implied mood? (surprise? anger? hopelessness? none of these?)