A. No it isn't 20 minutes.Some of these reasons are perfectly relatable and not petty in the least! (corrupted saves and stuff)
Anyway I couldn't play RE2 remake past the opening because I hated what they did with the "city escape" portion at the start of the game. It's literally like 20 minutes of gametime in the original, but it was easily my most anticipated part to see updated.
B. You do see it updated in the remake.