May has said that she will start the process by the end of March — meaning that Britain can expect to be out of the EU by mid-2019. But many uncertainties about the withdrawal process remain because Article 50 has never been used before. The negotiations could be extended at the end of two years, but only if Britain and all the other 27 EU countries agree. Should the government lose, it will have only weeks to introduce legislation to trigger the Brexit process before its self-imposed March deadline. Many lawmakers have indicated they will not seek to overturn June's referendum result, so May should get her green light to trigger Article 50.

Source: Fox News January 17, 2017 15:38 UTC