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When talking about time durations, can we use at ... to? For example:

The class is at 5pm to 6pm.

I know the ideal use would be:

The class is from 5pm to 6pm.

  • The one hour [long] class is at 5pm? – depperm Aug 1 '17 at 19:04
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    No, at...to really sounds queer, though one can understand what you mean. – user66974 Aug 1 '17 at 19:12
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    The class begins at five and goes to (lasts until) six would work. Is at indicates a momentary point in time. – Davo Aug 1 '17 at 19:33
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    You can, in much the same way that you can drop-kick a brick. (In other words, you shouldn't.) – Hellion Aug 1 '17 at 21:28
  • Sorry, Lydia, and the ideal use would be not is but 'The class lasts or runs from 5pm to 6pm.' – Robbie Goodwin Aug 3 '17 at 0:30
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The problem here is that at only works for one specific referent (literally, a single location in space; metaphorically, one moment in time). It's not suitable for a range of locations / times.

As OP recognises, from [StartTime] to [EndTime] is a valid usage. I wouldn't say it's "ideal" though - it's just one alternative to consider when making what's essentially a stylistic choice.

In many contexts (including OP's exact example), between [StartTime] and [EndTime] could be a good choice. But that won't always work, because sometimes it might be understood to mean that the [class, whatever] starts at some point within that time span (and finishes at an unspecified time which might be within or beyond that range). But it's also fine to dispense with the first preposition entirely...

The class is 5pm to 6pm.

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I would probably say that the class starts at 5pm and finishes at 6pm

  • or: ...starts at 5pm and runs until 6pm. – J.R. Aug 1 '17 at 21:23
  • or '... at 5pm, lasting to/till 6pm.' – Edwin Ashworth Aug 1 '17 at 21:40

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