Just over an hour
Yes, it is a hard mission. Darned those S300 SAMs. You need to use all your Anti-surface fighters together; maybe relocate the Danish ones to Sweden for shorter turnover.
I have found that if I sneak up on the northern fleet from the other side of the Aland islands and fire missiles over land, the defense picks them up much later. Firing missiles at it piecemeal makes it for a very long night; you need to mass your attacks.
After several attempts I found a nice tactic that seems to work. Being an airforce dude I really wanted to do something cool with all the fighters, so I made a long COMAO train of planes going out of Copenhagen to a holding area well west of the Russian ships. 4 HARM shooters (singletons, widely spaced, not in a group), 3x4-ship of F-35 anti ship (the version with most NSMs) each with a dedicated tanker (yes, I reequipped ALL fighters at copenhagen ASAP). Abeam the Swedish base I also launched 6xJAS anit ship. When everyone had reached their holding they were topped off by the tankers and all set course east. In the lead 4-ship HARM shooters (to launch Preemptive, or I guess in NWAC bearing only shots), followed by and impressive WALL of the 3x4 F35 and 6xJAS. Oh yeah, I also included a 4-ship of air superiority fighters, all shooting at max range to make the russians turn out of my way!:laugh:
As the HARM shooters were in range, so were the anti ship dudes, and I tried to lauch all my crap at once! Thats when my Macbook pro started to get really warm and I had a bit of lag, but taking into account the number of planes, missiles and SAMs in the air it was just adding to the fun! The russians kept firing sams, and the HARMs found their way(most of the at least). The russians stood no chance agains the massive amount of NSM and RBS-15 (i think, cant remember the name, the JAS anit ship thingy anyway). There were even a group of anti ship missiles left after the russians were gone!:laugh:
Also to note is that I killed the russian BO-AT furthest to the south with my southernmost BO-AT group (I told you I'm an airforce guy, everything on the water is a BO-AT.. period) while the guys were rearming at copenhagen.
Other tips I've found that work well (general):
I always set my fighters on CAP to only fire on my command and fly them high for best sensor pickup. Then if I don't need to kill anyone (just keep them away) I command one jet to fire on someone, and immediately after launch put him back in the CAP to patrol. That way one missile is lauched, the russians turn and all is good. So my CAP fighters never fly in groups. I also, if possible, launch one air sup fighter together with a tanker and put them a way back from the cap with all sensors on (assuming no awacs or similar). They can stay there forever, the tanker giving fuel, and the fighter picking up stuff (max altitude).
When hunting for subs with the poseidon I've found that if you hold the CTRL button down and START clicking out sonar buoys where you want the poseidon to drop its LAST buoy, then clicking back towards the aircraft it will actually drop its FIRST buoy where you do your LAST click... Then it will follow your click sequence until the point where you STARTED... confusing enough? Try it! Maybe not revolutionary, but I like it. Also I try to space the buoys so that they just overlay, you can see their range by clicking on the buoy, and then on the sensors section (the same way you can bring up other sensors/weapons rangerings).
I love this game!
Special thanks to JanH for all the answers on the forum! Do you ever sleep?

You deserve a raise!