Most of those indictments were arm-twisting, not proving the case, already existing, and grab-bags of anything they could get. They still didn’t start as indictments for 5 months for the first one.
These cases have a much higher burden. A year to a little more than a year is about right.
The Spygate perps have had years to destroy evidence and concoct CYA stories. They are much harder prosecutions now after years of Deep State and Dem gaslighting.