Never had a calendar. Would have been pointless, as it happened, because things changed. I was about 1 year out when I was accepted for a Degree in Fashion Design (very competitive, was sure I wouldn't get in), so I managed to take leave at half pay for 9 months. When I got back, I worked for 2 weeks and was told I had more leave owing (HR had worked out the 9 months, so the extra leave was a surprise). That was an extra 2 months - and then I left without coming back.