Keeping an offer

[Linda B.]

I have a property we put an offer on a few weeks ago.  3-4 weeks ago to be accurate.  The owner has been very correspondent and has always gotten back since we have been in contact.  he is assessing things with his tax guy, from what he says, and I touched base with him last week and still he says the same thing. Any suggestions on how long an offer should be good for?  I believe the market in that area is about the same but I am concerned by the time he responds it will change or he is just giving us the run around.  Any advice would be helpful.

Thanks