It's your server, you're the one who can tell if that's normal for your server.
If you feel that's excessive for your server, or you want to reduce it, investigate what's using TempDB and see if you can optimise them to use less TempDB space.
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)SQL In The Wild
: Discussions on DB performance with occasional diversions into recoverability
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