Hi. I just started a new job as overseer on a sheep property. My working week is 38 hours Monday to Friday. In the contract it says 'there will be occasions when you will be required to work outside of these hours for which overtime does not apply. This is considered a prerequisite for the position you hold. Nothing else has been said about overtime hours, but I was told that extra hours worked will be taken off in lieu. So far, the past 8 weeks I have done 87 hours, working nearly every weekend. l'm worried that it's going to get so big, I won't be able to take it in lieu. Today the manager had a talk to me and said he was disappointed I took a weekend off three weeks ago, because it was prior to shearing, and he may have needed me on the Saturday. I should also make myself available to stay on the property every second weekend just in case the owners need me for something. Is this reasonable under employment law? I don't think I have a leg to stand on.