I just noticed that you were asking about the return and not the outbound. I think the above is still good advice. As for timing, it depends on age and physical condition. If you are able to walk at a reasonably brisk pace for a significant distance, you should not have any trouble. While the route is circuitous and quite long, we found no significant delays or bottlenecks during our recent return EIS-MIA-JAX. It was far less taxing than a hike up Norman, for instance. And we did check a couple of bags on the return, so we had to collect those and then deposit them back with the bag handlers as well.
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