Not yet.
If you wanna read magazines or mangas without checking grammar books and dictionaries much,
myabe 2 years would be OK. (of coz that really depends on your progression; 2 years is the time for taking 3 summer courses in one summer and keeping learning Jps afterward in a pace of 3 hrs per week)
2008-11-23 22:47:58 補充:
Actually, I started my Jps thru summer course. I took 3 summer courses which were abt 80hrs in total. After that if u r willing to look up dictionaries and grammar books very often, I thk u will be able to read some passages slowly.