Tā chūguó liúxué, zhìshǎo yào yīniánbànzǎi cáinéng huílái.
He's studying abroad; it'll be at least a year or so before he's back.
Tips
usage
载 here means 'year' (same as in 千载难逢). Vague time expression — usually implies 'quite a while,' often in sentences noting that the task takes longer than expected.