Personal stories for the OP:
Dated my husband for 4 months. Got lots of “nu’s” from 2 months on for those who saw us as shlepping along; got plenty of “but how can you be so sure after just 4 months?!” from others who thought we were rushing into things. We didn’t feel comfortable getting engaged after 6, 7, or even 12 weeks, so we didn’t; at four months, we felt confident enough and that there was no reason to continue dating. Result? Happily married nearly 2 years, eagerly anticipating a very special simcha very soon 🙂
Other stories: A couple we know got engaged after the usual 6 dates despite serious reservations by both of them; they were divorced within 6 months. Another couple we know started dating when they were seniors in high school (more MO, they met through NCSY), dated through that year, year in Israel, and 2 years of college. Once you tallied all that, in addition to the engagement, they were together for close to 5 years before actually getting married. They were divorced even quicker than the other aforementioned couple.
Moral of the 3 above stories: Pretty much what everyone else has been saying. You have to go according to your own pace, and it’s probably better to stay away from extremes on either side.