(e)The total amount of leave on full pay which may be granted to a teacher on production of a medical certificate is limited to one-thirtieth of his active service in the school, and to six months at any one time. If further medical leave is required in continuation, it may be given on half pay at the discretion of the managing committee up to a limit of six months or more on production of a fresh medical certificate. If still further medical leave is required on continuation, it may be given without pay up to a limit of one year more. When leave on full pay on medical certificate is not due for the whole of the period prayed for, the applicant may be given leave on half pay for the balance, provided that the total period of leave on full pay and half pay together must not exceed the prescribed limit.