I added the ppcTimer library and counters at beginning and end of the trigger outine. The words are output to the CODA files after the header 0xdeaddead, the counter are on 64 bits, so the 2 32 bit words are first counter and the second 2 are the end counter,
so 2 minus 1 will give the time spent in the trigger routine, in counts.
On a MVME6100, the bus frequency is 133 MHz, one count is 4 bus cycles, so 30 ns.
So the time in nanoseconds will simply be number of counts * 30 ns.