Is 20 minutes of exercise okay?

I’ve recently (not even a week ago lol) started getting some motivation to workout again. It’s not really a lot of motivation since it’s not enough to make me want to do an hour, but I’ve been doing 20 minutes of cardio (maybe a little more? I only know it’s under 30—Just around 25) and then after that I just stretch for about 15 minutes. It’s not a lot, but it’s better than how I was during the school year where I lost the motivation to even workout for 5 minutes. I’m not sure if I should try to add more time of cardio or something to my workout or if the amount I’m doing at the moment is fine for now.
Is 20 minutes of exercise okay?
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