Advice to a novice train traveler: 3 day pass or go day by day.

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I would just like to verify my understanding of the Eurail Spain pass in regards to "days" traveled. My understanding is that in one day you can go to any amount of stations as long as it is in one day. My example: I land in Madrid and would like to go to Barcelona on a one way trip one day, then one weekend I'd like to go on a day trip from Barcelona and to Madrid and back again, then last I'd like to go back to Madrid from Barcelona for my flight home. So in my understanding I would need a 3 day pass correct? Any advice would be appreciated thank you.