Time

After Solomon prays the prayer in 2 Chr. 6 "the glory of the LORD filled the temple". There was some sort of physical presence of God on Earth. The priests could not enter the temple because of this. Then the people take about 8 days to sacrifice and celebrate. 8 days! That's a long time. But God must have been pleased with the dedication as He speaks to Solomon and part of it is this:

2 Chronicles 7:14 if my people, who are called by my name, will humble themselves and pray and seek my face and turn from their wicked ways, then will I hear from heaven and will forgive their sin and will heal their land

Which, while I knew the verse before, I hadn't seen it as an echo to what Solomon prayed earlier until now.