When you leave the bread out, it will gets old (stale).
At room temperature, bread has a short shelf life of approximately 3 to 7 days. Use of the refrigerator or freezer as necessary, together with proper sealing and storage, can all contribute to mold prevention and extended shelf life. The entire loaf should be thrown out if mold is visible since mold can release toxic mycotoxins.
Note that If bread is kept in warm, humid conditions, it is more prone to go bad. It should be kept sealed at room temperature or colder to avoid mold. The normal shelf life of room temperature bread is 3–4 days for homemade loaves and up to 7 days for store-bought loaves.
Therefore, since the sentence is still in motion, one need to use the present tense of verb and that is "will"
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