I see that this system uses blockchain transactions in some way. Does this mean that the result will change at any given time? in other words, let's say I roll a 50, then immediately roll a 92 for example. Would this 92 appear if I had waited say a few minutes? or does the next roll result change with every passing second? hope this question makes sense.
Some do, some don't.
For off-chain games, they don't (generally) rely on blockchain transactions or blocks, at least none of the popular ones.
Usually, on-chain games like SatoshiDice and Luckyb.it have txid as a component and another daily secret key for which hashes will be given in advance.
https://www.satoshidice.com/files/daily-secret-hash.txthttp://luckyb.it/secret-key-hashes.txtSo, the bet result would be different if your transaction id is different or if the bet is made on another day.
Does it matter?
No.The bet result is random and still has exactly the same probability of being a particular result.