What is the appropriate amount of lighters to pack for a seven-day trip?

[airportworker]

oooooooooooooooooooooooooooh,
"..I See.." said the blind-man

so,
you're an airport worker eh
..the-same-folks, who've confiscated all dem lighters from me over the past few years

so,
you got a locker full of lighers eh
...i always *wonder*-ed WHAT dem did with all those lighters they take from passengers/travelers.

now i know
..they in YOUR-locker(s)

smith i work for those who do it in a more relaxed way then the TSA, i.e the british