[spoon]

Originally posted by Grandpa Kim:
Okay, spoon, I'll bite. How can you do that in two turns!? Details please.

Glad you figured it out...
Two turns for any ship in Turn-Based, since there is not a limit on the number of times you can retrofit the same ship. More or less rendering the 150% limit meaningless.
In simultaneous games, about ten turns (just guessing) for a Star Destroyer. Eight for a Warp-point opener.
Cost is roughly double. I think.

I can imagine the conversations at Fleet Central:
High Wormlord: We need a Warp Point opener and we need it NOW!
Navy Command: Yessir! We are building an empty hull right now.
HW: Isn't it quicker to put the components in first?
NC: Oh no, we do that later. See, they are putting in the Ion Storm Generator now.
HW: But I want a warp-point opener!
NC: Right, but it is much faster to first install this Storm Generator, and then remove it after we pay the bill.
HW: What?!? Hey, why are you installing eight cloaking devices?
NC: Don't worry, we'll take them out as soon as they are paid for.
HW: I need a drink

-spoon