The engineering team is aware of a problem with Windows when the application has been open for an extended period, and is investigating.
I'm also running Windows 7 with LR CC2015.8 and have never seen LR use more than 8GB of memory. However, I do see what appears to be a memory leak when editing a large number of images, but again LR’s memory usage never exceeds 8GB. I have my system set to go into standby mode after 15 min. and use LR all day long (~12 hours). Every night I shut down the system and reboot in the morning as standard procedure.
I ran a test over the past two hours with standby mode turned off (high-performance mode) and left LR idle in the Library module:
LR MEMORY USAGE
Start: 492 MB
After 60 min.: 889 MB
After 120 min. 892 MB
A possible cause of what you are experiencing may be due to incomplete file removal of the previous version (LR 4) during the LR 6 upgrade. I’ve upgraded every version of LR incrementally (LR 1>2>3>4>5>CC2015) and did experience an issue during the LR 4>5 upgrade that I was fixed by deleting the Preferences file and letting LR create a new “default settings” Preferences file.
You upgraded from LR 4 directly to 6, which may be why you have the memory leak and I don’t. If that’s the cause then the advice at the below link may be a possible solution:
Use with caution and only if you are comfortable and experienced with Windows Registry editing. The above procedure requires reinstalling ALL Adobe applications currently on your system. Make sure you have copies of the install files and all serial numbers before starting.
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Please update the Lightroom to 6.9./2015.9 version which includes the fix for Lightroom 6.8: Memory Leak | Photoshop Family Customer Community