When you sit down in your Thinking Chair to ponder over a mystery, there's a chance you could be there for a while. Even a brilliant mind like Sherlock's sometimes needs a good chunk of time to mull through a vexing situation, so don't feel bad. Best to prepare yourself and hunker down, and keep a throw blanket close in case it gets a little chilly. Or in case a thinking session turns into a binge-watching-Sherlock session. That happens to the best of us.