CIL generation wouldn't complete in AX 2012 R3


We are trying to generate full CIL on AX 2012 R3. Previously, it used to take around 15 mins to complete CIL. Since last couple of times, we are facing issue of CIL generation not completing. We don't get any errors, however, the CIL generation will go on. It's been 3 hours since started & CIL has still not completed. Is there a way to check what is causing this issue?