Is it just me or has sabbing planets been taking a long time to get the structures off once sabbed. I asked a legion mate to sab a planet. He said he did it but the def on the planet (only had 1 def structure) didn't go down. Failed that invasion, my mate failed and then eventually the def went down. Wasted a tri (with relays and ions on, and i was too close to leveling) and a paradox to get the planet

Are you certain that the first sab didn't take out a population or invasion defense structure(solider outpost & council bases are sabbable), and then a 2nd sab took out the defense building, after your failed invasions.