How do I say this to my maid?

I need to tell her that we're going out at 7:45 am on Monday so she needs to come on time at 7 am. I know a lot of the words but not sure how to say it... "ham mera work jaeengi 7:45 Monday par. Please aaenge saat baje." ???? That is bad ha ha - how do you say 7:45? I only know hours...saat baje, nau baje...how 7:45? Help! :)