First whole day of heavy usage, I've been using the camcorder throughout, sending and receiving files over Wireless-N, sending and receiving files using S-Beam (which uses WiFi Direct), playing games, surfing the web, multiplayer games syncing, social networks and so on. Mixture of WIFi and HSDPA usage and a quick session of Satnav testing.
Brightness was varied from 35% to 100% outdoors.
I would never even dream of getting 4hours+ with the S2 and extended battery. Not over 16 hours anyway!
Edit* Bugger, I realise I never screenshotted the details screen there, I sent the screenshots over as I was in bed last night so half asleep. Still, that's the time with not even idle battery consumption thrown in over night. Factor that in and it's well over 24 hours
Also, USB OTG works fine, paired up an SSD formatted using exFAT, NTFS gives an error that the FS is unsupported although we all know that will change with custom kernels
Interesting to note, people freezing stuff using Titanium, don't freeze MyFiles.apk as when you plug a USB drive in, it calls for MyFiles which auto loads and shows you the drive contents. MyFiles is also called in other areas around the phone.