'Is there any optimal way to set TTL for currency exchange rates?

We inherited legacy application and in this project we deal with currency exchanges. Our app fetches currency exchange rates and stores them in Hazelcast with TTL of 24 hours. The problem is currency rate can change multiple times a day and FX doesn't work on weekends. Is there any creative way to cache such volatile items with and what would be the TTL?

spring-bootcachingcurrencyhazelcastttl


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