how to say, "About how long have you worked here?"

[dcpearljam12384]

How do you say "About how long have you worked here?" Any help would be appreciated. Thank You

[fireemblem8088]

Whooh, Pearl Jam!

I can only assume you want to know this so you can pick up the girl working at your local Japanese restaurant, so I will try to help.

どのぐらいここで働いていますか？
donogurai kokode hataraite imasuka?

どのぐらい (or どのくらい/どれぐらい/どれくらい)　means "how long" in this case. You could also say いつから (from when) if you're interested in when she started.
ここで means "here".
働いています (or 働いている if you don't want to be so polite) means "have been working" in this case.

[dcpearljam12384]

Thnx fireemblem, PJ fan to PJ fan, I thank you

[brad12]

you can say like this およそどれくらい長い間、あなたはここで働いていますか? . for further information you can take look

Learning Japanese online | Hiragana chart

[fireemblem8088]

I am about 99.9% sure that my suggestion is more natural than what was just posted. I don't know why he felt he needed to contribute, other than to pimp that website.

As for that website... I took a look at it. It's hard for me to comment too much on the Japanese, not being a native speaker, but a lot of the English is a bit off, so I'm a bit weary to trust it. I'd stick with JP101 or a good textbook.