I think it's a shorter time span than that, if they avoid relegation within 3 years it's a miracle.
They finished 10th last year but they were awful and had no goal difference. Its a club gathering negative momentum, ripping apart at the seams, the squad is shite, they've spent a billion in a decade where they have won a couple of fa cups and been out of the Proper European cup so they can't pump cash into it for fear of failing sustainability rules, there's not one player they can sell for 100m to at least buy a couple of ok footballers in necessary positions, the academy is churning out kids who have impossible expectations to live up to because "they're the next Matt Busby, he's just like Ryan Giggs", there's the haunted spectre of the motorway shitter hanging over everything, the hated owners have sold some shares to a fuckwit who has destroyed the world's most successful cycling team and ran his other club into the ground, who's doing his best to sack anyone and everyone and penny pinch hundreds of pounds while giving a previous manager a brand new contract despite under performance and then have to pay out millions within 6 months when understandably things don't improve, you also back said manager during the off season to the tune of hundreds of millions of pounds while also visibly courting any replacement, the hospitality looks like some 80s social club that's just had a lick of piant done by the treasurer and his son and stuck some led lights around the room while within the same city the top of the line in corporate hospitality is on show in a fantastic modern looking space, the fucking roof is leaking, each game has new video of mice and rats running across the pitch and they're selling undercooked chicken to their fans.