Specific time to visit the graves
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Question: With respect to men, is there a specific time (legislated) to visit the graves? And is there a specific time (legislated) prohibited to visit the graves?

Response: There is no specific time (legislated) for visiting the graves. There is no harm in visiting (the graves) at any time during the day or night. And it has been authenticated that the Prophet (sal-Allaahu `alayhe wa sallam) visited (the graves) at night.

Shaykh Ibn 'Uthaymeen
Fataawa li Ahlil-Mayyit - Question 33, Page 36
Liqaa. al-Baab al-Maftooh - Volume 7, Page 31