Website called "smappen" with a map of Poland and neighboring countries, with concentric circle-ish layers drawn in different colors: in 2h I can reach Slovakian border, in 3-4h most of the southern half of Poland, most of Slovakia and part of Czechia; in 5h whole Slovakia and most of Czechia, and Poland up to German border, Belarusian border or Poznań; and in 7:30 most of Hungary, half of Austria, border of Slovenia, most of East Germany, Gdańsk, or Lithuanian border.