They last for a calendar month. Therefore a goodybag purchased in February will last for 28 days, whereas one purchased in March will last for 31 days etc.
Good Afternoon @tennand1 . Indeed, giffgaff Goodybags (click to view range) last for one calendar month, depending on the month they were purchased/activated. A goodybag bought in February will last for 28 days and a Goodybag bought in March will last for 31 days. Giffgaff Goodybags come packed with UK data, minutes and texts, and our Gigabags include UK data only.
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Hope this helps.