I am a manager in a blue chip multi-national contracted to work the standard 37.5 hrs a week. last week I worked on an major project with a significant deadline which involved me working 18hr days for 8 days solid thru the weekend. When I spoke to my manager about taking some time in lieu to recover I was told that this was at the managers discretion and the guideline was to take one day off for each whole weekend worked. I do lots of extra hours already as we have partners on the west coast of the US so I am often required to do teleconfs and turnaround documents in the evenings which I never take time off for and I even for last weeks 18hr days I was prepared to write off the exta 10hrs a day in the week but wanted recognition for my weekend...what can I do here? If I go to HR it will not look good -- but is this illegal? any advice?