ethics of giving 2 weeks notice?

[Marlow]

I'm in a job where I'm working on many long-term projects simultaneously. I'm almost solely responsible for all of them. I'm leaving my job soon and I'd like to know if in your opinion you think it's Ok to only give 2 weeks notice. I've always given more elsewhere, but it would help me a lot if I only gave 2 weeks here.

I've been in the job for 2 and 1/2 years.

Thanks,

Marlow