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"2 hrs" is a perfectly acceptable way to write "2 hours" in written English.
You can use it in any context where you would normally use "2 hours". For example, "We need to finish the project in 2 hrs."
Exact(50)
sleep in 2 hrs.
Sana'a-Socotra 2 hrs.
Flight time London-Budapest: 2 hrs.
At the Big A, 2 1/2 hrs.
Ferries: Dunkirk (2 hrs) or Calais (85 mins).
When I got to the pier I learned Huguette's boat would be 2 hrs.
Similar(9)
Concert began 1 1/2 hrs.
Flight time London-Antigua: 8 1/2 hrs, Antigua-Tortola: 1 1/2 hrs.
He'll miss the city, he said, but it's only 5 1/2 hrs.
His wife, Mary Ellin, didn't wait for an ambulance this time (they waited 1 1/2 hrs. last time), but instead went for a cab.
Therefore the responding T cells had divided with an apparent cell cycle time of ∼2 hrs.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com