Battery life will vary based on usage. For normal use, the remote batteries may last two months or longer. Does your Roku remote support private listening? This may also be one factor for the battery drain.
Please reply here with the serial number of the Roku device associated with the affected remote. It can be viewed by navigating to Settings > System > About.
My remote Model RC 116 for my Roku Premiere+ drains batteries weekly. It is only used about 2 hours a night, so no reason for it to use so many batteries. I didn't realize that so many people using Roku were having same problem till I finally decided to search on internet for Roku remote problems.
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We appreciate your patience for the time being!