This is my interpretation of the rules in the link above. Anybody who feels i m wrong somewhere can humbly correct me if i m wrong.
Taking an example for the month of August:
ABC works 7hours a day(excluding lunch hours) , 6days a week = 42hrs a week ( i.e. 7hours a week in excess of the institute's regulation of 35hours pr week)
ABC took leave on a weekday during the month.
Status of ABC at the end of the month:
1) ABC has completed 31 days of Articleship.
2) ABC is already eligible for 5 days of leave (i.e. 1/6th of actually served 30 days).
3) ABC can take credit for 28hours extra worked (i.e. 7hours per week * 4weeks).
4) ABC's total leave credit is 5days and 28 hours and therefore after apportioning his leave for 1 day he now has 5days and 21hours leave credit.