Bhai Sahib Bhai Randhir SIngh Ji use to recite Chandi Di Vaar reguaraly as part of his nitnem. I remember a jatha singh once telling me that when reciting Chandi DI Vaar one shouldnt be idle afterwards. They should no Naam Abhyiaas or recite additional paath.
Baba Nihal SIngh Ji mentions people shouldnt have any dubdhia about the time of day when reciting Sri Chandi Di Vaar. Personally I dont see the need to recite this bani at night time before going to sleep .
My belief is that Sri Chandi Di Vaar should be recited before placing shasters or placing big Sri Sahib on. I believe this was the maryada of Sri Chandi Di Vaar. Miri Piri Malak would always bow to shasters before placing them on his body. Sri Guru Ji would also recite the first 5 names of Guru Sahiban. Sri Dasmesh Pita Ji would also honor shasters and recite first 9 names of Sri Guru Ji and praise Shakti of Sri Akal Purakh. Sri Chandi Di Vaar aka Sri Bhaguatee Ji KI Vaar also mentions first names of Guru and is in praise of Shakti. For this reason
I believe this bani was often used when giving satkar to shasters. By satkar I dont mean hindu worship of Aaarti.