Why did Romilly wait 23 years for them to come back from Miller's planet

The plan was to spend about an hour on Miller's planet to gather the data then come back to the Endurance which would only take about 7 years. How long do you think Romilly was going to wait for them to come back? If they all died on Miller's planet would Romilly just wait forever or would he eventually leave to complete the mission. There was no way that he could know if they were alive or not but the longer he waits the more fuel and resources go to waste, including time.

When they were all deciding what the game plan was they were talking about time as a resource just like food and oxygen. Doyle said that Dr. Mann's data is promising, but it will take months to get there. And Edmunds' is even further. Why are they talking about time as a resource when Romilly was willing to stay put for 23 years. In actuality, Romilly could have ventured to the other planets and send TARS down in the ranger to pop on the planet's surface, retrieve the data and determine if it is habitable, and then pop back up the the endurance. Romilly could have explored the remaining planets and still make it back in time to pick up everybody else from Miller's planet. Not to mention he could have even used the fuel more efficiently by going to the other planets. TARS was controlling the Endurance to stay within the range of Miller's planet for 23 years and wasted a lot of fuel; by the time they came back they only had enough fuel to visit one more planet.

I enjoyed the way it came out and it was cool to see Romilly age but I think in real life, Romilly would have gave up on them to explore the other potentially habitable planets. He had 7 years to kill, why wouldn't he just go to Mann's planet that only takes months to travel to. Granted he would use fuel, but slowly using fuel over the course of 23 years seems just as bad. Plus he would have probably stayed there until all the fuel was gone.