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Not exactly-esp if it is a D/E sub with AIP.That is twin propulsion systems.Such subs have an (overall) endurance of upto 50+ days.The new German Type-212/214s can go upto 70 days on patrol,with upto 20 spent at a stretch underwater on AIP.They could increase that time by using the D/E option.Besides,more & more countries are looking at integrating land-attack missile capability to their D/E-AIP subs.The Russians have developed a VLS for their Amur class subs which allow upto 10 heavy cruise missiles to be carried without compromising the boat's torpedo tube launch weapons.

Well, I guess I was thinking of the time on station for these versus a boomer or fast boat. Eventually the AIP will have to be refueled or you risk running on the surface for an extended period. The nuke will eventually have to be refueled, but we're looking at a 20 year cycle instead of several months.

Still, with their stealth capability, widespread deployment of these units will eventually force a paradigm shift of US military strategy and tactics. Better to think ahead and have something ready to go than be caught flatfooted.