I usually thaw in a bowl of water or if urgent, run under running water. 24 hours if never touch saliva and kept in fridge. After you heat up, within 2 hours.
You can look up breastfeeding mothers' support group in fb. They have a panel of counsellors there for all breastfeeding related questions
Thaw in fridge. Normally it will be thawed in 12hrs so i calculate the timing i need to use. After thawed, need to consume within 24hrs.
I generally put some warm water in a bowl and thaw the frozen breast milk.
if urgent. put in a bowl of hot water.. if not.. thaw it in the fridge.
thaw in container of boiled water