You need 40,000 Dungeoneering tokens, so you need to get about 400,000 Dungeoneering experience. I couldn't find any reference on how much experience you typically get per hour, and I don't have enough experience myself yet.
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i would recommend gravite rapier since it's a stabbing weapon and in free to play the best weapon for stabbing is a longsword/sword but if u have 40k tokens and don't have gravite 2h you should get that first because 2h is at the speed of a battle-axe and has much higher strength and accuracy than any other weapon.
The overall best f2p Runescape weapon is actually a range weapon - Maple Longbow (sighted). It has a range bonus of over 100. The best f2p degradeable weapon is the Gravite 2h. Both are Dungeonneering weapons and need 45 Dungeonneering levels.
The best melee weapon for non-members is probably the Gravite Rapier, in terms of damage per second. The weapon with the highest accuracy and strength for nonmembers is the Gravite 2h sword, though this weapon attacks much slower. Please note that both of these weapons require you to dungeoneer for quite a while, especially if your combat level is 90 or higher.
I have found a very useful, informative, and clear guide on an f2p range 2h guide found in the Zybez forums. ( Runescape Community ). Its called RngnStr4Lyfe's Guide To A Successful Range 2h PKer. The Link to it is here ... http://www.zybez.net/community/index.php?showtopic=1222855 Heres another one:... http://gameolosophy.com/games/online/runescape/runescape-range-2h-guide-2/
A shield or a prayer book. sheild, book and 2h sword