That's what attracts me to the genre - you don't have to sit for hours - a playthrough can last maybe 30mins on some of the longer games. Of course you CAN sit for hours practicing but that's up to you - it isn't one of those timesink genres.
I also have a Gigwing video - ALMOST beat that game - I got to the true last boss (TLB) you only get to fight if you have beaten all the 6 levels without continuing. Will post that one too.
I am currently working on Dodonpachi Daifukkastu (aka Resurrection) on the 360. I have 1CCed it in Novice mode but that is like setting up base camp when climbing Everest - this games has a PILE of content.
It only has 5 levels but there are so many ways to play it is head spinning. So I am tackling 1.5 arcade mode and have got to the last level but I have some way to go before I 1cc that mode - and then I have to move to a different style of ship. Then there's hidden URA path in the game to beat. Then there is 1.51 mode. Then there's the Black Label Mode. Then there's the Arrange A and Arrange B modes...….most with 3 ships each with 3 different styles....
There's a difficulty level and way to play for every level of skill.