I have just upgraded my WordPress software to the latest version. The (major) software upgrade took 10 or 15 minutes. There were no problems.
I hesitated long time. Maybe the reason was that I do not post regularly. It looks like I am a little bit trapped in the daily grind. There are some interesting things to share with you, though.
Currently, I feel a new drive to revive my blog. This is because I am occupied with many exciting things regarding different aspects, e.g. code style, software development process, personnel management. So, I am quite sure that my frequence of posting will increase in the near future!