I am using a demo with Trading Technologies, which I believe is one of the most realistic demo platforms available. What I notice is, and very frustratingly, most of the calendar spreads I pull up in the instrument search can't be traded, because they do not have a bid or ask. Some just have either the bid or the ask. This applies to both front month, near month and long dated month securities. So it is not exclusively long dated contracts I mean here. You would imagine, that for there to be more variety available for traders, liquidity needs to be added by somebody. TT does seem to allow you to set your own limit prices, but I'm not sure if this is a legit way to trade very Illiquid products. I am interested in both liquid and Illiquid, however right now it seems to me there are actually very few 'liquid' products to be trade in the futures market.
I have attached two screenshot images of my TT account as evidence.
I have attached two screenshot images of my TT account as evidence.