dublin brexit transition period around two years envisage eu draft guidelines friday decent amount time long period could need ratify future trade deal irish prime minister leo varadkar say two years decent amount time would happy long also comfortable two years varadkar tell news conference hail friday agreement irish border significant day whole island would add one word caution transition phase two years obviously go want negotiate new treaties uk eu take many years negotiate treaties long transition phase view must link long take us secure ratification treaties irish pm cautious two-year brexit transition period