Well, a one inch stack of hundreds is about $22,500, so you're talking about a 2.25" stack of bills.
You don't want to hide it (i) in an obvious place or (ii) in something else that might itself be stolen (say, a laptop).
Offhand, a good place would be in the attic, under the insulation - you can easily climb up and grab it (you know the insulation its under), yet it's a place a thief is unlikely to look - and even if they do, there's a large area where it might be. On the other hand, it's an obvious place for LE to look, so it's not ideal.
A better place might be inside some old discarded electronics you have in a storage closet, something unappealing to burglars and that wouldn't raise any eyebrows if it didn't work - for example, unscrewing an old Simon electronic memory game from the 80s, removing the circuit board and stashing the stacks in there, reassembling and then stashing it in some box in the closet. Fairly quick to get, and likely to be overlooked even in a thorough search in which the box of old crap is dumped out - and yet if you need to run, you can grab the game quick and get out.
Another possibility that comes to mind is to roll the money into a tight cylinder, wrap with plastic, and stick it down into a large container of peanut butter; easy to overlook, easy to grab in an escape. It would be advisable to have no crackers or bread in the house if you do this to reduce the likelihood of hungry FBI agents deciding to have a snack, and discovering $50k in the peanut butter...
You could also bake it into a loaf of bread which you then store in the freezer.
A few ideas anyway