Razza, seeing that you have been on cell signal all that time and you have 33 minutes of SoT already in 9% of battery life that seems normal to me, I mean you are averaging about 5.25 of SoT with that same usage and that on the same ballpark that me and others are.
Just remember, when you use your phone constantly or in this case every single second since it was unplugged, it's just draining as its normal pace, and more if that usage is just for Web browser, all browsers are draining the battery more than any other app as it's constantly using data and refreshing plus the normal white pages for background.
Like I mentioned above in this case with over 5.25 of SoT it's very good battery life not just for this phone but for a lot out there. When things get complicated to understand and troubleshoot is when there is the regular usage of turn it on a couple of minutes, then off, then a game, then a browser, etc... But just pure constant usage helps to really give you an idea of the battery life your phone is really giving you.
I unplugged my phone 31 minutes ago and like you it has been 31 minutes of SoT basically all Web browser usage and I'm at 93%, basically the same than you, but one little difference, mine has been at wifi all the time, so don't feel bad, if you ask me, what you have posted is very good.