Collaps sort

i have a simple way, i have 3 users, Peter, John, Micheal
each one has more than one record, with timestamp
i want to sort each one desc (according to his time stamp)
and sort the results asc/desc
for example john (3pm, 4 pm, and 9 pm)
peter (1am, 4pm, 8 pm)
so i want finally to be like
john --> 8
peter --> 9
i tried collaps but it wasn't working fine,
any help please

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