What is advised to do when plants haven't been watered for at least a month and the soil is still soggy? Is it holding the water because it is still in it's resting period? The pot(s) have good drainage holes and the soil is one from Scott's which contains self time releasing plant food.

Soil that stays soggy for a month or more is very likely to rot the roots of most houseplants.

Jiffy is right about pot size. Using too large a pot is the most common of all plnatcare mistakes and inevitably leads to root rot.

I am not familiar with all of the different brands of potting mix and they change the formulations all the time. However, a good potting mix will contain lots of porous material, such as perlite, bark chips, and peat moss. Porous means that there are lots of air pockets in the soil that provide air to the roots. "Heavy" soils are dense and not very porous. They retain moisture for a very long time and tend to suffocate plant roots.

Avoid potting mixes that contain soil and additives that retain moisture. Peat-based, soilless potting mixes are best for most houseplants.