Dic: the demands of something, demands on you

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[N-PLURAL] usu N of n, N on n | The demands of something or its demands on you are the things which it needs or the things which you have to do for it.

• ...the demands and challenges of a new job...

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demands [plural] the difficult, annoying, or tiring things that you need to do, or a skill you need to have.

• demands of: the demands of modern life
• demands on:
  .. The curriculum makes great demands on the teacher.
  .. There are heavy demands on people's time these days.

.... Cobuild, LDOCE

cf. Dic: make demands on, make demands of