Personal time at my job can be used for any purpose, but was instigated for sick leave, or taking care of sick kids, for a major loss of work time because of surgery or an accident, or to attend a funeral of someone. I guess it depends on how you feel about your job and about others performing your duties when you are not there, possibly putting others in a bind. I try not to abuse mine personally, using single vacation days first, then personal days. But if I were to have an accident, requiring me to be off of work for a time, my vacation would be used first, and then personal time. Sort of an insurance against a loss of time.