LoadRunner might not be the best tool for this.
How long do these batch jobs take to run? Seconds? Minutes? Hours?
My gut reaction is to place inside the jobs a couple lines of code to grab the start/emnd times and write them to a log. Then look at the log.
Or if the batch files are pristine and you're not conmfortable editing them, place them inside another batch wrapper than writes to the log. Just an idea.