3 times in the evening, and whenever you stop at a place while travelling.
أَعُوذُ بِكَلِمَاتِ اللهِ التَّامَّاتِ مِنْ شَرِّ مَا خَلَقَ
Aʿūdhu bi-kalimāti-Llāhi-t-tāmmāti min sharri mā khalaq
I seek refuge in the perfect words of Allah from the evil of what He has created.
Sahih Muslim 2708 · Tirmidhi 3604