Between all of the character voice commands and responses, how many individual voice lines/files are in TF2?
According to GCFScape, as of 29-08-2015,
sound/vo currently contains 26 folders and 11,347 files. This can be further broken down:
voitself has 4445 files, which are the main voices for the nine classes, the announcer, and the Eyelander.
vo/bot_workerhas 9 files, used for the robots in
vo/halloween_bombinomiconhas 62 files for the Bombinomicon on
vo/halloween_bosshas 18 files for the Horseless Headless Horsemann.
vo/halloween_eyeballhas 20 files for Monoculus, which are all edited Demoman clips.
vo/halloween_mann_brothershas 271 files for the Mann brothers of
plr_hightower_event, who replace the typical announcer there.
vo/halloween_merasmushas 703 files for Merasmus.
vo/items/wheatley_sapperhas 231 files for the Ap-Sap item.
vo/killstreakhas 22 files for the announcer relating to killstreaks, but I don't think they're used.
vo/mvmhas a total of 4041 files, which are all robotized duplicates of the classes' voice lines that existed at the time MvM was added to the game, used for the enemy robots in MvM.
vo/paulinghas 307 files for Miss Pauling relating to Gun Mettle contracts.
vo/tauntshas a total of 1218 files, where most of the nine classes' taunt-related lines are (though some are sound effects instead).