Regular pre-made juice is good for a year or more, out of direct light and heat.
PG and VG has a shelf life of 2 years.
Nicotine in solution with PG and/or VG is good for at least a year at room temperature if kept cool and dark and the bottles are topped off with minimal air space. If you refrigerate it, probably closer to 2 years. If frozen, even longer. If frozen at 0 degrees, several years.
I have 100mg solution in VG, and some in VG and PG, that has been frozen for almost 2 years and there is no sign of deterioration or oxidation. No dirty sock smell and little or no tanning.