I watched "The Blacklist" on that 105W mux last night (and every week) at 10pm Eastern time on Monday nights. They usually start shows around 8pm as "The Voice" came on last night from 8 to 10pm.
The NBC mux on 72W Ku that does the same thing, ie, only broadcasts regular NBC programming during prime time but this one isn't on any kind of regular schedule. You might get shows one week and not the next.
You can also get NBC stuff on KCWY on 99W along with WVGN on the PR mux on that same satellite, which is suppose to go away soon though. KCWY is broadcast for the Central time zone.
There's also an NBC mux on 103W Ku but it's 20* offset on skew and not received easily on a standard skew setting.