I made a handy little short list of how many docks you'd need to build a class of ship in 1 Year (4 turns), 1/2 Year (2 Turns) and 1/4 Year (1 Turn). If you're using Drydocks, just multiply the number of docks times two.

Hopefully some people will find this useful.
 
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[b]Sub[/b]:
0.5/Year per Dock

1 Sub in 1 Year with 2 Docks
1 Sub in 1/2 Year with 4 Docks
1 Sub in 1/4 Year with 8 Docks

[b]DD[/b]:
0.5/Year per Dock

1 DD in 1 Year with 2 Docks
1 DD in 1/2 Year with 4 Docks
1 DD in 1/4 Year with 8 Docks

[b]L. Cruiser[/b]:
0.33/Year per Dock

1 LC in 1 Year with 3 Docks
1 LC in 1/2 Year with 6 Docks
1 LC in 1/4 Year with 9 Docks

[b]H. Cruiser[/b]:
0.1/Year per Dock

1 HC in 1 Year with 10 Docks
1 HC in 1/2 Year with 20 Docks
1 HC in 1/4 Year with 40 Docks

[b]Dread[/b]:
0.1/Year per Dock

1 Dread in 1 Year with 10 Docks
1 Dread in 1/2 Year with 20 Docks
1 Dread in 1/4 Year with 40 Docks

[b]B. Cruiser[/b]:
0.07/Year per Dock

1 BC in 1 Year with 14 Docks
1 BC in 1/2 Year with 28 Docks
1 BC in 1/4 Year with 48 Docks

[b]Battleship[/b]: 
0.04/Year

1 BS in 1 Year with 25 Docks
1 BS in 1/2 year with 50 Docks
1 BS in 1/4 with 100 Docks

[b]E. Carrier[/b]:
0.1/Year per Dock

1 EC in 1 Year with 10 Docks
1 EC in 1/2 Year with 20 Docks
1 EC in 1/4 Year with 40 Docks

[b]A. Carrier[/b]:
0.05/year per Dock 
1 AC in 1 Year with 20 Docks
1 AC in 1/2 Year with 40 Docks
1 AC in 1/4 Year with 80 Docks