I don't think 1000mg is a small dose, I'm not a doctor but that seems like an extra-strength portion to me
The normal dose is 2 tablets (i.e. 1000mg in total).
Wait at least 4 hours between doses.
Don't have more than 4 doses in a 24-hour period.
Paracetamol is one of the most commonly used medicines in the UK.
Tylenol Extra Strength (acetaminophen, aka paracetamol) is also 500mg, but the recommended limit is 6 tablets (3000mg) in 24 hours.
1000 mg is pushing the daily limit (4000 mg, but it's got a halflife of ~6 hrs, so...)
Like many people, when I have a headache or a sore muscle I take the dose recommended on the Tylenol bottle: 1,000 milligrams. It is not even remotely dangerous.
Furthermore, if the original commenter is using acetaminophen to reduce rare psychological pain the margin of safety is even larger because she's using it only rarely.
A one-off 1000mg is, as you say, fine but if you're maintaining at that level, you are literally right at the DNE limit.
Acetaminophen
500 mg (in each caplet)
2 caplets every 6 hours