When personal preference and the amount of time spent working do not align, both men and women experience a decrease in subjective well-being. The negative effect of working more or working less than preferred has been found across multiple studies, most finding that working more than preferred (over-employed) is more detrimental, but some found that working less (under-employed) is more detrimental. Most individuals' levels of subjective well-being returned to "normal" (level previous to time mismatch) within one year. Levels remained lower only when individuals worked more hours than preferred for a period of two years or more, which may indicate that it is more detrimental to be over-employed than under-employed in the long-term.