It's easily twice as far from Tokyo to Hokkaido as it is from Tokyo to Nagoya.
I would say it's at least twice the distance from A to B as it is from A to C.
ーIt's easily twice as far from Tokyo to Hokkaido as it is from Tokyo to Nagoya.
「東京から北海道は、東京から名古屋の軽く２倍以上の距離がある」
easily twice as far で「軽く2倍以上の距離」を表現できます。
ーI would say it's at least twice the distance from A to B as it is from A to C.
「AからBの距離はAからCの少なくとも2倍の距離があるはずだよ」
at least twice the distance で「少なくとも2倍の距離」
ご参考まで！
カナダ 
