Holding a trade for months seems like a long time to me. But I suppose if you're trading in size, then you need an ultra-stationary spread that is worth waiting for to "ripen".Quote from Martinghoul:
It normally turns out to be months... In reality, it's either until it works, gets too close (i.e. a fly that has the front contract as one of the wings isn't really a fly) or something fundamentally changes that makes me reassess the whole thing. That's why one of the most important metrics for me when evaluating these trades is rolldown.
I'm glad you used ED in your example chart. I think the ED is the most flexible contract for spread trading. You have about 15 contracts in the first five years with decent volume. You can dial up any combination of directional volatility and convexity flex that suits you.
