I have made up the three examples below.
(1) I've heard about people who run for three straight hours without taking a break.
(2) I've heard about people who ran for three straight hours without taking a break.
(1) I've heard about people who have run for three straight hours without taking a break.
I think all of them are possible. (1) means those people run for three straight hours habitually without feeling tired. (2) means they did that probably when they were young. They can no longer do that. (3) they can still do that from a past time leading up to the present.
However, my non-native English speaking friends think only (3) works for them.
What is your opinion? I really appreciate your time and help. Thank you very much.
ansonguy What is your opinion? I find that both (1) and (3) are quite natural and usable. For the meaning you outlined for (2), I would change it a bit: I've heard about people who used to run for three straight hours without taking a break.
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ansonguyWhat is your opinion?
I find that both (1) and (3) are quite natural and usable.
For the meaning you outlined for (2), I would change it a bit:
I've heard about people who used to run for three straight hours without taking a break.
'used to' emphasizes a habit in the past more than just 'ran' does.
CJ