My character is 20 days old, or 480 hours. I have earned a total of 133887 LP. That gives me a rate of just under 280 LP per hour. Note that some of that was with full change, while I am now at 90% tradition.
At that rate, it will take me 703 hours to gain the 53 additional levels of exploration I need to start finding useful amounts of plants. I play about an hour a day at very most, and more likely half an hour. For the sake of this exercise, 45 minutes. At that rate, it will take me 2.63 YEARS of playing before I reach that goal, assuming I never buy any other skills.
And further assuming that I never, ever, die.
This is, of course, not very useful data. We need more data points, so please share your main character's age and total LP value so that a better statistic may be constructed.
Looking at my data, if we assume that I am only capable of 1/10th of the LP generation of a high level player with, say, 6 level 300 skills, they have spent 26 years of 1 hour a day gaming. I'm pretty sure that H&H is less than two decades old, right?