My empire just experienced a decade-worth of time warp, I think.
I had designed a simple thermal buoy the same size as my standard ASM missiles, loaded up enough to cover the jump points in Sol (3) and set off for each one.
Missile Size: 6 MSP (0.3 HS) Warhead: 0 Armour: 0 Manoeuvre Rating: 10
Speed: 0 km/s Engine Endurance: 0 minutes Range: 0.0m km
Thermal Sensor Strength: 2.4145 Detect Sig Strength 1000: 2,414,500 km
Cost Per Missile: 3.8635
Chance to Hit: 1k km/s 0% 3k km/s 0% 5k km/s 0% 10k km/s 0%
Materials Required: 1.449x Boronide 2.4145x Uridium Fuel x0
Since I'm unfamiliar with the Msl Launch button on the task groups window, I just assigned the loaded tube to a fire control, pointed it at a waypoint I had lying about in the system, and fired when I was on top of each jump point. It seemed to work, the buoys sat on the point, they didn't detonate, though it did show an eta of 1 second. So I order my fleet back to Earth for some overhaul, as my jump scouts come in for the same. I hit 30 Days with auto-turns ticked, and 22 full length increments roll by without an interrupt or construction cycle. At this point I unticked the auto turns button and tried some smaller increments, to no avail. My industry was frozen, my ships trapped in overhaul, their deployment counters steadily rising despite orbiting earth, all things from the construction cycle not firing.
So, I open up the Combat Overview for the ship that launched the buoys, an they're still there in the 'Missiles in Flight' tab. I destroy the lot, hit a 5 second increment, and nearly two years of mineral shortage, shore leave, research, new officers, promotions assignments retirements and so on land all at once.