How to size a log file partition

Just after a little bit of advice, I will be setting up a new database
server that will be running a database around the 200GB size. To make
sure that I get the best performance I plan to place the database files
on one RAID 10 partition and the logs on another partition either RAID
10 or RAID 1. At the moment though I'm struggling to size the partition
of the log file. Is there a recommendation to how I could go about
sizing this partition ?

Any suggestions would be much appreciated

Thanks
Frant101

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