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All I can is for a couple of days.
I keep mine up to 3 days. If you want to keep it longer, freeze it as soon as possible and take it out of freezer if you plan to use within a day.
2-3 days
My parents used to freeze all sorts of pasta dishes/meals after the kids moved out - that includes the left over pasta, sauce, sausage and meatballs too. (That's italian sausage though - not some popular breakfast product). Personally, I might be concerned if the ingredients of the lasagna had egg slices. That's a personal whim and I'd yeild to any competent response.
Cooked meat only keeps 3 days in the fridge: http://www.canfightbac.org/cpcfse/en/cookwell/ask/where_how/#218 If you've got leftovers that you might not want to eat that quickly - freeze them on the day you cook them (chill first). You can always defrost them tomorrow if you need them then.
3 days
Possibly 2-3 days at most.
A: Do not boil noodles, and do not cook the meat. Prepare sauce and let meat dethaw day before if wanted. A2: Or prepare the entire lasagna day before and cook in oven. Keep in fridge over night. Heat up servings seperately in microwave or enitre lasagna in oven at 250 Degrees {Note: The lasagna might be dryer if dont this way. }
Two Days
September has 30 days, so a third of September is 10 days.
Yes, it should be refrigerated, after cooking. Cover it , And I would keep it only for about 2-3 days after that.
According to this article you can freeze them for 5 days immediately after picking Refer related link