At nearly 2 years of age, the snake shold be on fortnightly feeds of between 10% and 20% of its body weight. The white material plus liquid is termed "urates". These are formed where an animal has more protein in its diet than it can use for new growth, repair and maintenance and so it removes the nitrogen from protein (as urates) which leaves carbohydrate that is used for energy. Most carnivores that are not going through a major growth spurt will do this. The amount of indigestible matter - fur, skin and very solid bone, is what makes up the faeces (No. 2).
There is actually no need to wait for the passing of a previous meal's wastes before you fed your animal again. Just keep a note of feeds and dumps and when it gets to the well past 2 weeks stage, then take a look at the animal to determine if if there is a problem.
Somethinh I forgot to mention in my pevious post. Snakes do not have the same amount of musculature in their gastrointestinal tube that humans have. So they need to use objects and exercise to help the matter in the tube move along. I always suggest they have a forked branch with a bit of a curve, in the cage as furnishing. It sits in like a tripod, nice and stable, with a bit of elevation that the snake can climb over. The alternative is a bit of exercise on the back lawn.
Blue