I've only recently delved into the wonderful world of bourbon, so I hope that some of you veterans don't mind my extremely basic question (and I promise that I tried the search function first):
How long after a bottle of bourbon is opened does it noticeably depreciate in quality? I ask because there are some bourbons that I've noticed can be found at a significantly better per/ml price if I buy a litre or 1.75 as opposed to smaller quantities. However, I'm currently afraid to do so after years of drinking wine and seeing a bottle noticeably depreciate in as little as 24 hours.
Tangentially, any information that you have on the ideal storage of opened/unopened bourbon would be appreciated, past upright in a cool, dark place.
And my apologies if this information is somewhere obvious and I simply missed it. If that's the case, feel free to just link me to a pinned topic without another word.
Edit: I noticed a few related threads at the bottom of this one. However, I want to make sure that it's clear that I'm not asking how long it will take the bourbon to go bad (i.e. become dangerous). I'm asking how long until the taste changes *at all*.