PHP & MySQL: sort desending and print

How do i get php to sort the times in a table and print order desending. eg:

in the table i have: 02:60.00
02:70.00
02:20.00
02:50.00
in that order in a table

how do i get php & mysql to print it in order by the smallest time first like this:

 02:20.00
 02:50.00
 02:60.00
 02:70.00

Convert the times to epoch, then sort the array according to size, then convert the times back to human-readable.