How long was Adam alone before Eve was created?
Scripture does not specify an exact duration. Adam was alone for the time it took to name all the animals, which was not a matter of minutes but a certain period of time. Eve was then formed from his side chamber and brought to him.
Les explains that after Adam named the creatures, God had already said it is not good for man to be alone. Adam was alone for however long it took to name everything, not minutes but a certain period. Then God caused a deep sleep, took a side chamber (rib), and made the woman. Les also points to Genesis 5:2 to show Eve was in Adam, part of him, to keep Adam as the federal head of the human race for salvation.