a month!! i have never tried soy sauce i flavor mine with curry powder and chilli powder it makes the difference sometimes but dont put the curry and chilli powder on at home cause if you have only brought 1 tin of meat and you have flavored them in curry and chilli and it doesnt work as good and you have not got another tin then your but what i do is buy 3 tins 2of those tins i use as feed and 1 i use as hook bait the meat you feed in chop some it to small squares of crush and the rest crush it and add hemp and caster in to swim as they go well with meat and fish the flavored meat over the