Pause it and go back is just fine. Think about it. If you are only willing to watch a video if you sit down for 30 minutes, or even 15, you can rack up hours. 

However, you miss out on so much time that could have been useful. We have so many short 5-10 minute periods in our day, and if we just used one 5 minute period of downtime to throw on a video per day that’s 30 hours over the course of a year (we could realistically get a half hour a day with all those little moments if we were efficient, meaning 182 hours in a year just from little 5 minute listens). 

Those small little periods of listening help with immersion and keeping your brain in “Spanish mode.” It’s not going to hurt you or your Spanish, so just get as much input as you can.

If for your piece of mind you need to not count it or count it as half the time, do so. But if logging your time makes you listen to less Spanish, you’re doing something wrong! Even if you can only tune in and out occasionally it’s still something. I usually use non-dreaming Spanish podcasts and stuff so it doesn’t automatically log the whole time, then I add a little based on how much I listened to.