ProSeries promised 🙄 that when we abided by the two step verification mandated by the IRS beginning this January, they would update by end of February to follow the IRS-allowed 12 hour time-out.

With current IRS security requirements your tax software login timeout occurs after 30 minutes of inactivity, however the IRS is extending this to 12 hours starting sometime in January. This change is due to the expectation that Tax Pros will have adopted two step verification to make their software login more secure. 

ProSeries will extend the login timeout in February. 

My calendar says March 5.

90 minutes timeout is not 12 hours, ProSeries.