Time frame to break/bust a trade???

I bought some shares of an ETF Friday morning around 9:40 am via ARCA; someone hit my buy order, yet it was extremely out of the market; curious if anyone knows if there is a set time frame for a trade to be busted?

If I sell/exit position now and then they come back to me and tell me that orignal trade was busted, then I would be illegally short and might have a loss on the trade.

Is everything ok after the trade day plus 3 day settlement period?

Thanks
 
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