Trust me, I've spent 25 years on this subject. There is a difference between conditional calls and absolute calls.
John / Billybob
Fair enough.
When Congress passes an amendment on to the states for ratification, the states have a federal duty to perform under the rules delineated in Coleman.
When a presidential election is held, the states have a federal duty to choose Electors and have them cast a state's electoral votes according to the rules delineated in the Constitution as modified by the 12th Amendment.
The petitioning of a state for an Article V Convention is not a federal duty, but an option. Thus, a state may attach conditions and timelines to said petition, and this right is covered by the basic concept of state sovereignty.