'Everything' is more natural than 'all things'. 'At a time' is not natural here; 'at once' works. 'At a time' has a similar meaning in such sentences as "Do one thing at a time'"
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LaboriousDoes it (at once) also mean "instantly" or "in an instant" (with no delay)?For e.g. He drank all the water in the glass at once. (Does it mean "instantly" or "in an instant", please?)'At once' usually means 'immediately'. In some contexts, it can mean 'at one time' - They all began talking at once. However, this usually works only if you are t