Question about Grappa

[TheEngineer]

I got a chance to buy a bottle of grappe from Romano Levi (the guy who draws his own labels). So now it is sitting at home....I've never owned a bottle of grappa. I assume that I cannot store it sideways, or is that true and how long does it last (does it go into a dumb phase and then emerges like wine or should I treat it more like a spirit, that it should be consumed soon but no great hurry).