I'm seeing that the TWR of the upper stage starts at .25 G, and has around a 20 min burn time. This TWR seems to be too small and I'm unable to get the SLS to orbit. Is a 20 min burn time for the upper stage normal?
Edit: I did get the SLS1B to orbit finally, and got around 60 metric tons into a 525 km x 511 km orbit, is that close to the expected LEO capability of the SLS1B?