Weeklong rhymes with:
budlong, chamlong, daylong, furlong, headlong, hourlong, monthlong, birdsong, budlong, chamlong, daylong, furlong, headlong, headstrong, hissong, hourlong, hussong, hysong, monthlong, plainsong, scuppernong, ssangyong
Weeklong sounds like:
waggling, weakling, wessling, wiggling