How long does LH surge last? When did I get my peak?

Question

These are my results, first pic from yesterday evening, tested twice, do they look positive? The Last pic is this morning, it also looks positive? I'm feeling a bit confused as of when did I get my LH surge exactly? Does anyone know how long LH surge actually last? TY

Answer

The whole surge from start to finish CAN last up to 36hrs, but the peak last only between 8-20hrs. Once it turns negative after being positive, it’s assumed ovulation has occurred.

Answer

I got this

Then the very next day it was this

How long does LH surge last? When did I get my peak?

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