Yes, one could assume that, particularly of elderly systems which require quite an amount of maintenance, 30% is a good estimate. In WWII for example, only 30% of german u-boats were actually on partol (with another 30% each on their way to patrol areas or in training) at any given time.
Considering how vast Russia is, those drones could pose a threat comparable to Panzerschiffe. You may have not many of them, but the threat of being able to be invisible until you strike whenever you want and wherever you want, being able to pick weak targets...even in a best case scenario this will force Russia to commit to take disproportionally big efforts to protect its assets. We are not even talking about the fact that those TU95 and T22Ms are Cold War era stuff, that just cant be replaced. Only the Tu160 is more recent and in production afaik.
Considering how vast Russia is, those drones could pose a threat comparable to Panzerschiffe. You may have not many of them, but the threat of being able to be invisible until you strike whenever you want and wherever you want, being able to pick weak targets...even in a best case scenario this will force Russia to commit to take disproportionally big efforts to protect its assets. We are not even talking about the fact that those TU95 and T22Ms are Cold War era stuff, that just cant be replaced. Only the Tu160 is more recent and in production afaik.
Cetero censeo religionem delendam esse