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Yeah; anything that prints to stdout in that loop gets sent to bc, that stuff included. You have to redirect your script to /dev/null with > /dev/null after the program.

redirect the output of 'done' into 'bc' with a pipe. That's valid for entire loops and such in the bourne shell, not just individual commands.

man time, for example, get the time :
time prog |awk '/^real/{print $2}'