how long to hold shares to get dividend payed

Hi All,
Sorry to go off the topic of mgx a bit although i'm looking to buy more MGX at some point in the future already being a holder of the stock at $2.69 (gritting teeth as I typed that).
Just a question from a newbie, put simply.
What is the minimum amount of thime that I must hold shares in a company in order to be entitled to be payed a dividend? For example if company xyz is going ex-dividend on the 1st of November & has a record date of the 7th of November. If I bought 10000 shares in that company just after the opening of trading *on* the 7th (record date) & then sold those 10000 shares a few minutes later, would company xyz still be entitled to pay me a dividend per 10000 shares at some later point (the pay date)??? Is it this simple or more complex. Basically i'm just looking at the possibility of making a *quick* quid buying shares that are paying dividends & holding them just for long enough to be entitled for that payment.

Thanks for any responses & best of Luck with MGX