I would agree. Go to the recording and hear how big the bend is, then replicate that in your playing.
There are programs, like were mentioned, that show 1, 1 1/2 etc next to a bend marking, but online most tabs won't have these.
So it's good to go to the source, the song itself, and double check.
I would do this anyway as most tab, even in books, has typos or errors. So the only really solid way to learn a song is to double check any tab/notation with the original recording.
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