Times for the y axis

Im trying to create what in my head, is a simple line graph. i would like the x axis to represent the days of the week. i need to plot one data point per day. but i need it to be represented by a time of the day. so my data set would look something like

Monday 5:30
tuesday 6:15
wens 5:50
Thurs 7:00
Friday 6:45
Saturday 5:15
Sunday 8:45

I want to be able to compile departure times each day and give them to my boss on a weekly basis so i can prove that there is a trend for certain days of the week. Im just having a hell of an issue with the time. I though maybe military time but with it still not being a numeric value i have the same issue. Also wondering if it would be possible to have excel average the times for say a months worth of tuesdays if i wanted to. Any help would be appreciated.
Thanks

Please have a look at the attached example.

Test.xlsx