Tempo ou horas - are they interchangeble?

Portuguese Questions
1

hi guys, quick question:

are there any rules regarding the use of these 2 words? Are there any situations where one is prefered over the other or where they are absolutely not interchangeble
Eu completo o meu trabalho a tempo/horas ?
Estou a chegar a tempo/horas?
o comboio parte a horas/tempo?
Eu tenho de chegar a horas/tempo?

just a few examples above where I am wondering what to do…

Elas conversam o tempo todo - in this case I got the feeling that you can’t use horas… right?

2

“A tempo” and “a horas” (always fixed phrases with the preposition “a”) are very similar, but not identical. “A horas” simply means “on time”, while “a tempo” is more like “in time [for X/before X]”.

  • Hoje saí de casa a horas. (Today I left home on time)
  • Entrámos mesmo a tempo. (We got in just in time)
  • Não vou chegar a tempo de ver o jogo. (I won’t arrive in time to watch the game)
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