My fiance and I decided after a month of dating to get married (he decided the minute he met me). We get along fabulously. We've had our share of fights, but nothing major or threatening to our relationship. We'll have been together for a little over 7 months at the beginning of October when we have our wedding.
I know that sounds quick, but I think when you know, you just know and why drag it out? He lives in CA and I live in SC, and we fly to see each other every other weekend, so it gets pretty expensive, and I don't know if our wallets could've made it a whole year or year and a half!
He is 38 and I am 23 (I know that sounds weird too, but it really isn't...he says I'm mature for my age and he is a total goofball and when I'm with him, it seems like he's my age). He is definitely financially secure, as am I, so it is the perfect time for us to get married.
My parents were engaged after 6 months and married a year after that and they have been married ever since. I know people who waited forever that have gotten divorced. I don't think length of time matters as much as a mutual commitment to each other and the marriage, although it does help to be able to commit financially to a marriage I think since most divorces come from money issues.
If I were the two of you, I would just get married. How long do you really want to wait? I guess I am just one of those people who knows what they want, goes after what they want, and then sticks to it. I am unbelieveably happy with my fiance and have no doubts at all. Maybe you are looking down on people who get married quicker because you want to be married but are too cautious to take that first step.
For what it's worth, I know a guy who was dating the same girl for 8 years and was engaged, but then broke it off and is marrying another girl 2 1/2 years later. Maybe you're making excuses because you don't really want to marry him.