You can get there in about 1 hour, but you need to change buses once at Sengoku bus stop. Just use this website to search for the bus schedule and other details. https://hakone-tozanbus.jcld.jp/HakoneRouteFinder/defaultForSP_EN.htm?ymd=2017/6/22&hour=15&min=30&FromEkiName=%E5%BE%A1%E6%AE%BF%E5%A0%B4%E3%83%97%E3%83%AC%E3%83%9F%E3%82%A2%E3%83%A0%E3%83%BB%E3%82%A2%E3%82%A6%E3%83%88%E3%83%AC%E3%83%83%E3%83%88(%E7%AE%B1%E6%A0%B9%E7%99%BB%E5%B1%B1%E3%83%90%E3%82%B9)&FromLatLng=35.30733272,138.96190360000003&ToEkiName=%E7%AE%B1%E6%A0%B9%E6%B9%AF%E6%9C%AC%E9%A7%85(%E7%AE%B1%E6%A0%B9%E7%99%BB%E5%B1%B1%E3%83%90%E3%82%B9)&ToLatLng=35.2333444,139.10426340000004&type=0