I don't know how it compares, but my recent AMD ThinkPad uses about 1% of the battery per hour while in "modern standby." I figure I have at least three and up to 4 days of being unplugged before it's forced to shut down.
Yours is the sort of things I got with my Linux work laptop, and it’s miserable: a few years down the line battery degradation means after a 3 days weekend you have even odds the laptop will have slept itself to shutdown.
That’s about normal for it.