How many number of topics can we check out at once from SDL 14.0 version to Oxygen XML Author 23.1?

I want to use Find and replace all in Oxygen Author 23.1. What is the maximum number of topics we can checkout from SDL 14.0.5923.4 version? For guides with many topics, what is the maximum limit? I want to know the limit so that I can use both the tools effectively and the application won't crash? 

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