Nothing, apparently.
In the King James version ....
The word "Sunday" is not mentioned. The equiivalent is "Sabbath", and that word appears 136 times - but neither the word 'twice' nor the word "church" appear in any of those verses, and the only mention of 'temple' is not relevant to the question.
Vaudaville days , performers did shows everyday and twice on Sundays: matinee and dinner.
----------------------- Christians are all different. Perhaps a small minority read the Bible twice a day, but many never read the Bible except in church, if in fact they attend. No doubt others read it occasionally, even daily. The reasons some read the Bible so frequently can vary from strengthening their faith, to overcoming doubts, or simply because they find the Bible inspirational.
About twice each year
In the King James translation, three times. Once in Matthew 16:18 and twice in Matthew 18:17.
twice
Moses struck the rock twice in the Bible in the book of Numbers, chapter 20, verses 7-11.
They attended church AT LEAST twice a week.
The name Salome is mentioned twice in the Bible.
twice
TWICE
twice
Christian appears twice in the King James Bible.