Depends on the level of twinking. With everything money can buy, including fungi and CoF and the best marketable weapons etc., you can solo to 50 without any particular trouble, and would be able to push it to mid-50s or possibly even 60 if you're stubborn. It'd be easy until 40ish, completely doable until 50, and challenging and a bit slow after 50. This is with just straight up killing mobs; you can pretty much forget about archery for leveling, because it just isn't fast enough to kill at a respectable rate. You'll level much faster just tanking blue mobs down and resting in-between.
If you can't afford the truly best but can suit up in things like FBSS, Lammies, standard twink gear and maybe an Ikky BP, you'll be able to solo to 30 with relative ease and to 40 if you're determined. After 40, you'd still be able to kill mobs but it would become really inefficient leveling, like with any melee class short of a fear-kiting shadowknight. You'll still be generally capable of soloing a blue mob, but your health and mana sustainability would just kill your xp/hour.
You can kite shit with a bow and dots. As with a lot of classes, rangers are able to kill stuff like that, but it's so slow and dreary that it's pretty much not worth doing. Like trying to level a cleric by root-nuking. Possible, but you're just better off looking for a group or not playing. We're talking many minutes per kill, and then time spent medding up afterwards, clicking your Tolan's bracer endlessly, and so on. Don't bother.
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