It's pretty simple. Each boy goes to a separate space (Boots in the bedroom and Snugs in the pack & play) and plays all alone for 30 minutes.
Here is a little glimpse into my life before we re-instated (I have no idea why we ever stopped) room time:
It's 4:45 and both boys are crying. The little one because he just got tackled by the Boots. Boots tackled his brother because I couldn't read him a story while I cut the veggies for the salad. I walk into the living room to try and fix things, but neither boy wants to be in my lap with the other. So I alternate between the two (neither satisfied) until Mr. Reliable walks in at 5:30 to see our messy house, teary faces, and dinner that's not quite ready.
Now instead each boy goes to his space at 4:45 and I do my final dinner prep, pick up the living room, and take a few minutes to sit my myself. When room time is over at about 5:15 the boys are so excited to be reunited, they act like they haven't seen each other in weeks and play together happily until their daddy arrives at 5:30.
It works perfectly; except on days like yesterday, when Mr. Reliable didn't walk in the door almost 6. On those days I just remind myself that someday this will all be funny.