For Alkylate 2-stroke oils (example: Husqvarna XP POWER) in its original can the storage time is 3 years if opened and 5 Yrs if not opened.
For gasoline ( SP 98 / SP 95/ SP 95 E 10) and ready fuel mixture, the storage time is 1 month maximum.
Please also in addition pay attention to always use the correct type of can or barrel for storing the fuel and fuel mixture.
Prior to refueling the saw please make sure to mix the mixture properly, to avoid separation by settling.