Uk tourist Visa question?

When I enter the Dublin airport on may 20 I told the customs guy that I would leave the UK on June 1 but what happen if my flight get delay would I have then overstay my Visa. Since I saw online you can get up to 90 days when an American enter the UK thought Ireland but I'm not sure if I was given 90 days or... show more When I enter the Dublin airport on may 20 I told the customs guy that I would leave the UK on June 1 but what happen if my flight get delay would I have then overstay my Visa.
Since I saw online you can get up to 90 days when an American enter the UK thought Ireland but I'm not sure if I was given 90 days or was given a shorter amount. This is my first time in the UK too.
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