We will need to see your SGP log file, especially regarding why SGP hangs. Ken or Jared will probably need to troubleshoot that part. Please see this post on how to ask for help:
A few comments:
1. The length of exposure shouldn't matter at all.
2. Elbrus requires VERY accurate hints (RA/Dec, scale and angle). If the angle is unknown and you don't enter it, Elbrus will fail immediately.
3. Consider switching to PlateSolve2 instead of Elbrus as your primary (non-blind) solver. PS2 is included with SGP as of 184.108.40.206. You do not need to install PS2, but you do need to download the astrometric files and point PS2 to those files in order to solve. Please see this thread for more information.
4. Ansvr (local Astrometry.net) can be a truly blind solver not requiring any hints in order to solve, however the solve will be much quicker if the hint data is accurate. I suspect part of the reason you are experiencing long solve times is because you are entering innacurate hint data (angle?) and that causes Ansvr to spend a lot of time searching, but that's just a guess.