FP and Coli 5 days. Compensation mails, only a few days. GW rewards, vip bonus diamonds, crypt rewards, gold hires, contest rewards have no limits. However I know of a few cases where people lost their mail hoard due to updates/lost recovered accounts after device changes. I tend to empty mine fairly regularly for gold spending/token spending/diamond contests/impending updates to "use it before I could lose it".