Concern About Final Call From HR After Salary Discussion

In the TCS interview, I had a technical round(Avg performance) , a managerial round, and an HR round. During the HR round, the representative discussed my salary expectations, noted them down in a sheet, and mentioned that I would receive a call for final confirmation. I had asked for a 50% hike.

Is it a lot? as per the HR, it was as they were to do 30% hike Based on this, is it possible that the HR might never call me back?