Just asking because i dont know.
Can a lot of work be done in the meantime besides testing missile launches?
Yes, if they got decent telemetry off their missile launches and decent data from the test detonations... They will be taking what they learned, analyzing it, possibly updating some designs. If they’re only changing piece parts, often they can be tested in isolation and relative secrecy. No one in their right mind expects NK to actually stop and give up. I’m sure the President and his people have no such delusions. We can get them to stop the big visible stuff like launches and detonations under threat of sanctions. But they will still be making some progress.