Stopped my Ditto, Raticate, Parasect, Primeape, Dugtrio, Hypno, Nidoking and Nidoqueen training at lv. 42. Am now at Indigo Plateau with a Pidgeot, Raichu, Gengar, Ninetales, Dewgong and Venusaur all lv. 45 after playing something like 52 hours. So yeah, it takes probably some another 5 hours before my party pokémon are at least lv. 50.
EDIT: WOO-HOO! Awesome! Rank up.