According to the Mayo Clinic--a strong source--ground flaxseed can last for several months if kept in an airtight container in the refrigerator.
http://www.mayoclinic.com/health/flaxseed/AN01258
Depending on how cold it was kept it may last for longer than the best before date. Try and consume it before then though for freshness, but generally after opening you should have 2 months before it goes rancid. Just make sure to keep it in your fridge.
The concern isn't microbiological, but chemical. It will turn rancid faster at room temperature. If it still smells and tastes OK, put it back in the fridge or freezer.
No, it will not keep indefinitely.
24hrs
That probably is too long. Smell the wheat germ; if it is rancid you should notice. Wheat germ in jars should be refrigerated after opening.
15 months
no it will finally rot
Yes but leave the door open to prevent mould build-up
Wheat doesn't grow into bread. You use wheat to make bread.
almost 3 days. the germ in the wheat kernel is what makes it rancid so fast.
If u leave food in there too long it may spoil
Atleast an hour but its better if you leave it overnight.
It can but dont leave your fridge open for too long!
At least 4 hours, in a refrigerator. If it's too "watery" when you make it, it may not set, no matter how long you leave it.
This is a chemical change.