I did my own little calculation over the weekend.
Five years multiplied by ten months in the year (we usually miss out January and August), plus three months for the beginning of 2009 (when we did do January) and three months for the end of 2003 = 56 months
56 months multiplied by 8 hours every first Friday = 448 hours
Plus 32 hours multiplied by 5 to include the additional hours that go with the "Forty Hours" during the last five years = 608 hours.
If I take into account one or two extra events not included in the calculation, that puts 608 hours as a slightly conservative estimate of the number of hours of Eucharistic Adoration that I have facilitated in the parish since October 2003.