local pos = {x=1,y=1,z=1}
local item_id = 1234
function onThink()
doBroadcast("10 min left")
addEvent(doBroadcast, 5 * 60 * 1000, "5 min left")
addEvent(doRemoveItem, 10 * 60 * 1000, getTileItemById(pos, item_id).uid)
addEvent(doCreateItem, 20 * 60 * 1000, item_id, 1, pos)
return true
end