More hours don't equal higher rank. The numbers prove it. Two real examples from accounts I've checked: a Silver II main with 4,200 hours logged, and an EUW Diamond III account that hit the rank in 847 hours. Same game, same ladder, 5× the time gap. The Silver player isn't lazy, they've just been repeating the same 30-minute match without changing what they do inside it.
Win rate plateaus fast on a single champion. After roughly 300-400 games on one pick, improvement curves flatten unless you actively review losses, cut your champion pool to 2-3, and target specific weaknesses (wave management, vision, mid-game macro). Without that loop, hour 800 looks identical to hour 4,000.
The bottleneck isn't time logged. It's deliberate practice per hour logged. A large share of accounts sitting in lower tiers have 1,500+ hours without breaking out.
So read the number above as exposure, not as a verdict. If your hours sit well above the median for your rank, the gap is technique.