Time to cap Lockpicking? Well a fast player can get their character to 60th in 12-14days of playing. To 70th? Maybe 10 more days? So at level 70th your lockpicking skill would be what 375/375? So you'd be at the top of your skill range in about 19-24 days playing, on average.
WoW, is not like UO where you can create a character and GM its skills or one skill the day you make it. Your not even given the lockpicking skill until level 16 then your only given the first window, 0-100 to gain in a training area. From 101-375 its 5 points at a time per level.
Example, my 58th Rogue is currently at 278/285 skill. She will hit 300 once she hits 60th, and that will open the 300-305 skill gain window. So at 60th she'll be 300 Lockipicking. No noob GM Characters in WoW, all skills, ie Jewelcrafting, posioning is level based gains.
Bo