Hold up, do you mean whole beans?
If that's the case, anywhere between three to five weeks, depending on the roast.
Lighter roasts tend to last longer than darker ones.

Pro tip: Never keep them in the fridge. The huge difference in temperature will cause the beans to lose flavour faster.
Once you get your beans and open the pack, seal them tight, keep in an airtight container in a cool, dry and dark place.
What's the budget like, if you don't mind us asking?
I'm no good at recommendations, but there are some folks in this thread selling off their pre-loved machines at good prices.

To my knowledge there are only a few machines within your budget:

- Philips Saeco Poemia
- Delonghi EC250
- Delonghi ECOV311

And if you are willing to stretch you budget for something that is much more presentable (IMHO anyways), the Delonghi EC680.

At this price, you get pretty much the same thing: single boiler, thermostat-controlled, pressurised portafilter, panarello wand.....

My budget is/was the same; that's why I can reply..... :-)

May want to try one before buying. At that budget, there are a lot of compromises.

If you don't have a grinder, get one first. Then a brewer or a few brewers, eg Moka Pot, Dripper, Aeropress etc.

But if you're dead set on a machine, lowkl's suggestions are spot on, unless you get one used.

Speaking of Saeco Peomia (which is quite in high regard among some beginners' circles), I don't know where you can actually "try" (as in, brewing some shots), but you can actually "touch" (as in, hands on) at most Harvey Norman shops.

Actually, I wouldn't mind taking part in a "shoot-out"... a side-by-side comparison of different equipment, techniques, beans. I can bring my Poemia & 600N grinder (pretty much the definition of low-cost, entry level espresso) to set the lowest baseline. All we need is a space, power supply for the equipment, a sink with a decent water filter..... pretty much everything else can be thrown in the back of the car.

3k budget for espresso machine and ginder?

Machine only consider
http://www.finecoffeecompany.com/shop/expobar-office-pulser/

Or the popular Rancilio Silvia

Going to Thailand reach out to him and get a quickmill but not sure if he carry their entry level line
http://www.thaivisa.com/forum/user/155631-quickmill/