You are making comparisons between Noah's day and the day that Jesus comes that Jesus Himself didn't make, in order to support Pretrib.You might want you read a little closer. They all entered in the selfsame day. That is one day. That day is the day that God told him to enter.
Genesis 7
13 In the selfsame day entered Noah, and Shem, and Ham, and Japheth, the sons of Noah, and Noah's wife, and the three wives of his sons with them, into the ark;
14 They, and every beast after his kind, and all the cattle after their kind, and every creeping thing that creepeth upon the earth after his kind, and every fowl after his kind, every bird of every sort.
Genesis 7
9 There went in two and two unto Noah into the ark, the male and the female, as God had commanded Noah.
10 And it came to pass after seven days, that the waters of the flood were upon the earth.
Firstly, God did not shut Noah and his family up in safety in the ark for 7 days as you argue. God gave Noah 7 days’ notice – allowing him to fill the ark with his family and the animals, saying, "For yet seven days, and I will cause it to rain upon the earth forty days and forty nights; and every living substance that I have made will I destroy from off the face of the earth" (Genesis 7:4).
Moses got 7 days notice before the rain came. In that time, he was directed to gather the animals into the ark two by two of all flesh, male and female (Genesis 6:19). He was also instructed to gather food for his family and the animals (Genesis 6:20). That gathering took one week. These 7 days would have given Noah and his family sufficient time to board all these animals unto the ark and gather sufficient food. When that was complete, God closed the door of the ark and the flood immediately came and destroyed all the wicked. Jesus confirms, “the day that Noe entered into the ark, and the flood came, and destroyed them all” (Luke 17:27).
Whilst all the wicked were swept away in this flood when the ark closed, the rain continued pouring down for 40 days. What is more, the water remained on the earth 150 days in total until the ark rested on Ararat.