May one own non-Kosher food in his home?
It is forbidden to own non-Kosher food in one’s home for a long period of time, due to fear one may come to eat the food. The food is thus to be discarded.
How long may the non-Kosher food remain in one’s home? All non-Kosher foods may remain in one’s home for a short period, which is between one to two months. This however is with exception to Chametz on Pesach which may not be owned at all, even for a short time.
Non-Kosher Bread: Some Poskim rule that non-Kosher bread [such as bread that was made with wormy flour] may not be kept at home for even a small amount of time. Other Poskim however are lenient, and so is implied to be the opinion of Admur.
May one leave their Hafrashas Challah in the freezer and save it to burn by Biur Chametz?
 Michaber Y.D. 57/20; Shach 84/17; Taz Y.D. 84/7; Rashal Perek Eilu Treifos 125, brought in Taz and Shach ibid; Admur 435/4; 447/1; Kuntrus Achron 446/1
 Admur 447/1; See Shach 57/47 “21 days is a short time”; Michaber ibid “12 months”
 The reason: Since one is accustomed to eating Chametz throughout the year one is to suspect one may come to eat it even if it is left in home for a short time. [Admur 447/1]
 Taz ibid
 The reason: As there is high chance of a mistake occurring being that people eat bread all the time and a mix up may occur. [Taz ibid]
 Rashal, brought in Taz ibid; Implication of Shach 84/17
 As Admur 447/1 rules that “all non-Kosher may remain for 1-2 months” and that “Chametz is an exception to the rule due to its stringencies and one is not to learn from it to other places”
 Admur 447/1
 Taz ibid regarding wormy bread, and seemingly the same would apply to Hafrashas Challah that is already baked [such as one who separated after baking], and perhaps even towards dough. Vetzaruch Iyun.