Let’s do the math real quick:

We first see plans of the Death Star in Ep. 2. We’ll use Anakin’s age as our measure of years so that’s A20. At the end of Ep. 3 in A23, we see the skeleton of the Death Star being built, so it clearly had been started relatively recently. Assuming it took some time for acquiring permits, contractors, materials, and so forth, let’s say they started construction during A22.

Flash forward to 20 years later (A42) during Ep. 4, the Death Star is completed. That’s about 20 years of construction destroyed by the Rebels.

THEN in Ep. 6 (A46) we see the Death Star 2 is almost finished with construction. So tell me how THE FUCK did the Empire build a BIGGER and BETTER Death Star in only 4 YEARS when it previously took them a whopping 20 YEARS to complete?!?!?!