I went into M&S to get milk , I gave myself 2 mins to be in and out at a quiet time and managed this. However in my rush I picked the two bottles right in front and of course they had the shorted use by dates. They both run out today. I freezed one immediately upon getting home but there is no way we can drink 4 pints of milk by tomorrow. 1 bottle is nearly empty..how long will the freezed one be safe to consume?