There is no correlation between xpm and Duration. Some has higher xpm, some has higher Duration. Objects are grouped into clusters (marked with different colors) based on close values of xpm and Duration.
xpm Duration
Abaddon 626.13 2372
Ancient Apparition 540.38 2535
Axe 658.18 2481
Bane 516.68 2434
Batrider 629.51 2396
Bounty Hunter 559.67 2388
Brewmaster 609.60 2389
Bristleback 646.87 2476
Centaur Warrunner 609.07 2447
Clockwerk 529.19 2457
Crystal Maiden 520.11 2437
Dark Seer 594.93 2447
Dark Willow 563.48 2487
Dawnbreaker 613.65 2399
Dazzle 484.47 2399
Death Prophet 622.56 2430
Disruptor 500.36 2435
Doom 632.95 2434
Dragon Knight 625.51 2442
Earth Spirit 547.59 2391
Earthshaker 597.59 2486
Elder Titan 589.06 2493
Enchantress 563.25 2447
Enigma 526.62 2465
Grimstroke 526.26 2450
Gyrocopter 581.06 2462
Hoodwink 571.75 2483
Huskar 632.19 2371
Invoker 650.87 2469
Jakiro 527.75 2459
Keeper of the Light 535.07 2433
Kunkka 672.41 2481
Leshrac 621.28 2437
Lich 522.82 2462
Lina 624.58 2470
Lion 517.09 2468
Marci 594.11 2372
Mars 596.87 2430
Mirana 555.04 2442
Nature's Prophet 630.17 2436
Night Stalker 629.97 2416
Nyx Assassin 620.62 2462
Ogre Magi 598.74 2437
Omniknight 578.25 2364
Oracle 492.49 2361
Phoenix 551.95 2443
Primal Beast 591.06 2437
Pudge 574.33 2427
Pugna 547.58 2414
Razor 640.06 2486
Rubick 536.17 2462
Sand King 629.88 2491
Shadow Demon 509.89 2471
Shadow Shaman 508.17 2443
Silencer 558.74 2465
Skywrath Mage 555.13 2455
Slardar 626.74 2438
Snapfire 551.47 2437
Sniper 666.50 2526
Spirit Breaker 633.66 2423
Techies 559.00 2490
Tidehunter 584.30 2438
Tiny 618.58 2427
Treant Protector 518.17 2424
Tusk 570.17 2411
Underlord 585.38 2420
Undying 538.93 2418
Vengeful Spirit 526.36 2400
Venomancer 526.91 2457
Viper 629.15 2515
Warlock 500.21 2442
Windranger 666.40 2466
Winter Wyvern 576.95 2466
Witch Doctor 537.57 2467
Zeus 625.78 2526
xpm Duration
Alchemist 723.28 2380
Anti-Mage 768.43 2423
Arc Warden 749.97 2445
Bloodseeker 715.13 2475
Chaos Knight 668.68 2402
Clinkz 652.74 2394
Drow Ranger 689.64 2493
Ember Spirit 716.62 2430
Faceless Void 708.88 2478
Juggernaut 731.11 2397
Legion Commander 671.52 2397
Lifestealer 702.15 2406
Luna 697.89 2402
Magnus 663.40 2391
Medusa 733.30 2484
Monkey King 669.24 2409
Morphling 707.35 2365
Muerta 698.13 2477
Naga Siren 705.00 2399
Necrophos 673.44 2420
Outworld Destroyer 679.49 2435
Pangolier 675.17 2449
Phantom Assassin 727.67 2423
Phantom Lancer 720.04 2435
Puck 697.82 2431
Queen of Pain 683.93 2458
Riki 748.27 2472
Shadow Fiend 714.33 2389
Slark 709.62 2408
Spectre 733.85 2534
Storm Spirit 701.28 2444
Sven 748.62 2434
Templar Assassin 737.87 2385
Terrorblade 665.88 2410
Timbersaw 651.24 2430
Tinker 723.55 2465
Troll Warlord 721.85 2420
Ursa 723.01 2441
Void Spirit 705.53 2396
Weaver 703.96 2480
Wraith King 678.50 2419
xpm Duration
Beastmaster 610.18 2328
Broodmother 629.89 2272
Chen 463.28 2276
Io 488.31 2280
Lone Druid 605.29 2270
Lycan 597.63 2305
Meepo 776.50 2263
Visage 618.57 2310