Data really doesn't make sense to me and got couple of questions...
1. Are there no breaks/lunches taken by employee?
2. Maximum allowed hours worked in a day? (usually 13 hours)
Basically, you'd need to outline to us, what assumptions and business rules should be applied to the data.
Also as vletm mentioned... there are bunch of duplicate, with only difference being S.no and Start/End time. Surely, one employee can't appear more than once on a same workday, process with overlapping time?
Personally, I'd use PQ & PP for this sort of reporting, if you have access to it.