Three weeks seems a little low, but I like the concept. My employer provides 8 hours of PTO per two-week pay period (at my level of years worked). This is sick, vacation, or whatever. It works well for the most part, but three weeks would be completely insufficient if you need any kind of surgical procedure. A rotator cuff repair put me out for three months. I was all right because I rarely get sick and take few vacations, but it wiped my balance out completely.