In general, one 2-hour session is not the same as those 2 hours spread over the week. One reason is that you can't work at the same intensity for 2 hours as you would for 30 minutes. Long runs are great if you're training for something, but I would recommend trying to squeeze in a few extra cardio sessions throughout the week. You can get a good workout in 20-30 minutes, so the quantity of time isn't as important as the quality of the workout. High intensity interval training is a good example of a challenging workout that's done in a short period of time.
I love to run long distance so when I do my training run I am usually out there for 1 1/2 - 2 hours. There have been weeks (more than I like to admit) where I don't get in my runs during the week so my only cardio is the long run on the weekend.
My questions is does it matter if you get all of your weekly cardio done at once or if you do it over several days. I do lift weights twice a week in addition to my long distance run.
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