Try the following using Wild Cards in a replace with a COPY of your document. Find:[0-9][0-9]:[0-9][0-9]^13
After a Replace, Ctrl+Z will restore things. You may want a space in the replace-with box.
If that leaves out ones with single digits in the time, then run it again without the first [0-9]
See
Finding and replacing characters using wildcards.