How long should humidifier take to humidify small apartment?
The question about the humidifiers is secondary, but related, to the presenting problem "to combat some severe sinus issues".

My wife and I, both, experience Wintertime related sinus issues (drying-out, nosebleeds, increased sensitivity to allergens, etc.).

The level of humidity needed to sufficiently combat the sinus issues of a person would be problematic for everything else; therefore, it's better to treat the person rather than create the ideal environment (or, for example, create the ideal environment in the bathroom and "hang-out" there, lol).

Recommendations for "treating the person" is beyond the scope of the HI/SE.