yes its about patience to reach a high powerlevel, this is my strategy, it gets me into the millions within days
1. as soon as i start, get 1K powerlevel and get to earth
2. Do ALL quests except chiaotzu, gives around 8k-9k PL total.
3 retrieve the dragonballs and wish for PL, gives 20K
4. Then either one of two things, which can be very effective, but vary in results
A. Either use the speed bag until i reach 130K then use gravitron (which is very fast)
B. or hit the zenni machine for a matter of hours until i have like 40K zenni (takes quite long) and then buy around 250 training bags and use the macro to destroy them all, this may seem a bit longer than tactic A, but in the end you'll have around 200+ more str than using tactic A. After using all the t-bags you should be well past 130K, (as a side note: if you choose to use tactic B, grab all the zenni BEFORE you turn 10K powerlevel, because then you can be killed and all that money you worked hard for can be stolen, and you don't want that.)
last of all, use the gravitron
and you're on your way
hope i helped ;-)