I divided this amount of marzipan into 2 bars and left them in the fridge until I had time to shape candies from them (you can work them immediately). They can be stored in the refrigerator for a month, so you can make more marzipan in time.
In addition, I noticed that after sitting in the fridge, the sugar / sweetener powder dissolves better in marzipan, so it tastes even better.