What is considered strenuous activity in regards to a long rest?


The description for a long rest states:

A long rest is a period of extended downtime, at least 8 hours long, during which a character sleeps for at least 6 hours and performs no more than 2 hours of light activity, such as reading, talking, eating, or standing watch. If the rest is interrupted by a period of strenuous activity – at least 1 hour of walking, fighting, casting spells, or similar adventuring activity – the characters must begin the rest again to gain any benefit from it.

Which of the following interpretations is correct in regards to what is considered strenuous activity?

a)

  • at least 1 hour of walking
  • at least 1 hour of fighting
  • at least 1 hour of casting spells

b)

  • at least 1 hour of walking
  • fighting
  • casting a spell

Personally, I think option b) is correct, because option a) allows for silly shenanigans. For example, assuming a combat encounter lasts 10 rounds – that is, 1 minute in game time – then it would be possible to have 59 encounters and still benefit from the long rest.