[Serkan Yegen]

Recording:
I assume that you would like record high quality.Internal recording to SxS cards possibly would not suitable for your shoot. The newest 64gb card could record aprox. 25 min with Proress4444.And time increase when you decrease the quality.I guess lowest quality 422LT could record duration what you need, however, quality is bad.

Alexa has two card slots but you need to cut between recording to pass one card to other.Also, changing sxs while shooting will be hard.

At that point, you need to consider external recorders according to your budget and need.With using two recorders and how-swap battery changer you could use Alexa for this project.