How long does wall of fire last? Wtf?

[Reaptor]

I'm trying to loot these bodies and wall of fire just WONT END.

[Wb_*]

until concentration lasts, or you get far enough I think

[Air Buffalo]

If you casted it yourself, you can toggle it on the bottom left of your hotbar where you see buffs and such.

[galvantua]

Looks like 10 turns (or one minute), or when concentration ends. Assuming you casted it, you can click the "x" on the bottom left by your hotbar, which will end concentration. If someone else casted it, you can hit them to make them take a CON saving throw, or just kill them or knock them out.