Eight games, 24 days, three competitions.
Livingston's visit to Parkhead tonight kicks off a hectic and onerous run of Celtic fixtures that interim boss Martin O'Neill has described as season defining.
Three of the first four games in this sequence are at home - but the final four are all away, including two derby trips to Ibrox.
Bottom club Livi, with respect, are a gentle introduction before tougher tests await. Celtic visit a Kilmarnock side fighting for their Premiership lives on Sunday before hosting Stuttgart next Thursday in the first leg of their Europa League play-off.
Then it's Hibs at Celtic Park before the second leg away to Stuttgart as Celtic bid to advance to the last 16 of European competition for the first time since 2013.
Once their European fate is decided, Celtic play Rangers twice at Ibrox - in the league and Scottish Cup quarter-finals (date now confirmed as 8 March) - either side of a rearranged midweek visit to Pittodrie.
O'Neill's men have little room for slip-ups in the league as they try to chase down Rangers and leaders Hearts, whose derby win over Hibs on Tuesday night put them nine points clear of Celtic having played two games more.
Speaking at his news conference on Tuesday, O'Neill said of the impending run: "We have to try and stay in contention. Quite a few fixtures are big for us.
"Two of those matches anyway are because we've qualified for the knockout stages of the Europa League, so that's good news in one aspect.
"I didn't really want the exertions of the game in Feyenoord and the big effort in Bologna to go to waste, so we've beaten Utrecht and let's get on with it."
And football writer Stephen McGowan, a guest on Wednesday's BBC Scottish Football Podcast, believes that with a "heck of a run" looming, Celtic must make the Livi game as "effortless as possible" to conserve energy.