Bug #6195 - Easy, just a preference with a tz-id. Or, we can make it part of the data model explicitly. Either way, it's 1 day.
Bug #6196 - Easy. 1 day
Bug #6199 - is the master bug. Comment #2 should be its own bug which is a dependency of 6199
Bug #6200 - 3 days, tops.
Bug #7868 - Just UI stuff. How hard depends on PPD feedback, but I can't imagine it being too crazy.
Bug #7974 - Ha, easy. 30 seconds.
Bug #8110 - Odd little bug. < 1 day.
Bug #8501 - See above wiki estimates.
Bug #7890 - don't know much about superscripts, but I'm sure this is an easy CSS tweak. < 1 day
Bug #8477 - Not sure. I think Jeffrey has an algorithm for doign this in python, if so 2 or 3 days.
Bug #8398 - Need design proposal.