The period from first contact to first cash request could be a few days or a few months but regardless how long you've "known" the person, a request for money is a scam.
Scammers operate from countries with low per capita income and even if a scam takes months to pay out it is worthwhile for them, even for just a few hundred dollars.
This is another common scam used by Russian scammers.
You come across a profile of a young, attractive woman on an online dating site or maybe she contacts you.
At this point she will set the victim up as her knight in shining armor, the only one who can help her.
She might just need money to pay her bills but will probably want desperately to come and visit him in his Western nation.
Sometimes, they will even cite certain immigration requirements to sound more convincing.
But rest assured, once you send that money that is the last you will hear from her.
Typically, a man comes into contact with a scammer through an online dating agency.