You are right. Genesis 1:1 is not part of the following 7 days of creation. And those creative days are not limited to the 24 hour concept, since in Hebrew, the word translated "day" can be of various lengths, even shorter than 24 hours.
Jehovah God introduced this fundamental division of time on the first “day” of the period during which he prepared the earth for mankind, when diffused light evidently penetrated the swaddling bands, thus causing the moisture-covered earth to experience its first day and night as it rotated on its axis through the light of the sun. “God brought about a division between the light and the darkness. And God began calling the light Day, but the darkness he called Night.” (Ge 1:4, 5) Here the word “Day” refers to the daylight hours in contrast with the nighttime. However, the record thereafter goes on to use the word “day” to refer to other units of time of varying length. In both the Hebrew and the Greek Scriptures, the word “day” (Heb., yohm; Gr., he·me′ra) is used in a literal and in a figurative or even symbolic sense.
This flexible use of the word “day” to express units of time of varying length is clearly evident in the Genesis account of creation. Therein is set forth a week of six creative days followed by a seventh day of rest. The week assigned for observance by the Jews under the Law covenant given them by God was a miniature copy of that creative week. (Ex 20:8-11) In the Scriptural record the account of each of the six creative days concludes with the statement: “And there came to be evening and there came to be morning” a first, second, third, fourth, fifth, and sixth day. (Ge 1:5, 8, 13, 19, 23, 31) The seventh day, however, does not have this ending, indicating that this period, during which God has been resting from his creative works toward the earth, continued on. At Hebrews 4:1-10 the apostle Paul indicated that God’s rest day was still continuing in his generation, and that was more than 4,000 years after that seventh-day rest period began. This makes it evident that each creative day, or work period, was at least thousands of years in length. As A Religious Encyclopaedia (Vol. I, p. 613) observes: “The days of creation were creative days, stages in the process, but not days of twenty-four hours each.”—Edited by P. Schaff, 1894.
The entire period of the six time units or creative “days” dedicated to the preparation of planet Earth is summed up in one all-embracing “day” at Genesis 2:4: “This is a history of the heavens and the earth in the time of their being created, in the day that Jehovah God made earth and heaven.”
Young Earthers live by a dogma created by the Catholic Church (and which has abandoned it). Yet they are mainly Protestants!! Explain THAT one!!