Before boarding the Eurostar, you have to go through security (xray of bags and metal detector for people), and juxtaposed boarder controls (show your passport to immigration officers from the country you're heading to). That can all take a bit of time, so most passengers are required to start this process at least 30 minutes before the train departure.
Once you've been through all that, you then wait in a departures area for boarding (typically starts about 15 minutes before the train is due to leave). I've been through Brussels, Paris and London before, so I know what their departures areas are like. Generally they have a cafe, a shop or two, quite a lot of seats, wifi (free in London, paid for elsewhere), and a frequent travellers lounge.
I've not caught the Eurostar from Lille before, but I will be doing so in a few weeks, so I'm wondering what the departures area after security/immigration there is like? Any shops? A cafe? Wifi? Enough seats? Eurostar Carte Blanche / Business Premier lounge?
And possibly related, does the normal 30 minute minimum checkin for most passengers / 10 minute checkin for Business Premier ticket holders / Carte Blanche holders apply at Lille too? Or is there a shorter cut-off in light of the smaller passenger numbers?