Yup, with our current technology, it'd take approximately 38,321 years to travel one lightyear. The closest known potentially-habitable planet to the Earth is Gliese 581d, which lies approximately 20 lightyears away. Traveling at 17,500 miles per hour (28,163.5 km/h), the average speed for our current mode of space transportation, it would take about 766,420 years, which is probably not going to happen for a whileOn the topic of colonization, NASA has some years now been searching for planets similar to earth. There have been many finds and even some close one, only a few dozens light years away.
Except that a light year is a unreachable speed for us right now. Bummer...