FS is dead

Must make sure I change my policy for a day earlier 😀

There seems to be an implicit assumption in your question that all loans are of equal merit and that there is some 'right number' to sell at. If you look at the SM, you'll see that the current discounts/premiums vary tremendously. That's because each loan is different and has a different risk profile.

The best thing to do is calculate how much you value holding your loan versus how much you'll receive in selling it, then check the SM and see whether the current queue matches up with what you'd like. If it does, then join the front of the queue. 

And, no, it does not always sell. The 1% maximum discount sometimes causes too much of a log-jam.

 r1200gs 's question to answer.

Since I'm trying to distract myself from being starving as my dinner's not ready yet, I'll answer anyway.

The SM on FS is actually one of the very least crazy markets going, IMV. Loans are sold at premiums if they're considered valuable by all, and sold at ever-increasing discounts if they're not. Knowing what represents good value in a price on the SM requires homework and a keen knowledge of your own tax situation. 

I personally would advocate said homework if you want to succeed, as there is no solid curve in how the market decides the discount level at any point beyond the intrinsic value of the loan and the latest news on it. For example B*** cottage went on the SM at the full 1% discount shortly after launch, whilst you can sell some bling loans at nearly 1% premium with only 35 days left.

I'd suggest inspecting a few loans that are old-ish but still trading above par, and see if you can work out why in each case . Same for loans that look particularly heavily discounted early on. Once you're not surprised by where each loan is sitting, then you're probably about there 

Ooh, dinner's ready!   

TLDR; I wouldn't sell at 100 days necessarily, sell if and when the value you place in the loan is exceeded by the market price that appears achievable (at front of queue).

Not really dead, not very different from any other average week.  Several renewals and plenty on SM with generous discounts    For me the highlight was BMW renewal, went in seconds, but I managed to increase my holding by 150%.