Argentina to Brazil by bus (too long? maybe)

Hey guys!!

Ok, I'll try not to extend myself too much because then my english gets weird.

I'm planning a trip to Brazil. I've already been there. The thing is I want to make it by bus, this long distance companies. So, the problem is that I've never travelled by bus on Brazil, only on Argentina. So has anyone traveled by bus on Brazil and wants to share his experience or tips or something?

I think I'll make Buenos Aires to Rio de Janeiro, it's about 40 hours.

Ok, so, any advice or experience would be reaaaaaally helpful.

Thanks in advance!

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