Since it's all AC (or partners) AC won't let you book the tickets if there isn't enough time. You should get all your boarding passes in S'toon so at worst you'll just have to go through security again and if the line is long, just go to the front. It might be worth a check to confirm you can get all your boarding passes at once.
Again, if it's a real concern then take the ~10am flight and you'll have a load of time to wander around the airport. Get a bunch of change and play pinball for an hour. You'll have enough stress with all the flights and just going to Ghana (internship?) will be stressful enough.
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