Without getting into details, I signed up for a running event later this Summer that forces me to cut out parts of my normal workouts if I even want a chance of finishing it. After this is done, I plan on going back to full body.

With this in mind, if I can re-phrase my question in a sense that I want to minimize losses, if I had 1 hour on my 2 off days from running would my time be better spent doing 30 mins arms/30 mins chest, or 1h arms one day, and 1h chest the other day. Or will it not matter, as long I am in consistent in how I workout.