University schedule - check for duplicates and/or overlap

Hi,

I have compiled schedules for severeal classes/groups and I would like to check for duplicates based on information from multiple cells. What I would like to check is if the "date" (column F), "time" (column I), and "Person" (column J) is the same or overlap. E.g. the person is scheduled for one group from 8-12 but also with another group from 10-14 (which obviously won't be ideal). I would also like to do the same control for date, time and room, so that two groups doesn't occupy the same room at the same time, or their classes overlap at the same room.

With som help I was able to concatentate and match text strings, wich highlights the row if the above information is excatly the same, but not if the time overlaps.

Any help would be appriciated! Feel free to add any helper columns, spilt the time column in start/end time or whatever is needed. I am pretty familiar with hos to build formulas, but I just can't figure out how to solve this. So if anyone is able to point me in the right direction or present any working formula I would be very happy. If VBA/macro is needed thats okey, I am familiar with basic VBA.
Workbook attached.