Shri Kunjika Stotra
One who does not have an opportunity to recite entire Shri Durga Saptashati can recite Shri Kunjika Stotra; most certainly performing entire Shri Durga Saptashati is always better. But, one who recites entire Shri Durga Saptashati must recite Shri Kunjika Stotra prior to completion of theirs devotion offerings.
It can also be recited to pay your homage and show your devotion at any given time. It does have magical powers to strengthen your personal Aura-Shakti and remove negativity from and around you.
It is said that God Shiv told this Stotram to Goddess Parvati during their discussion of spirituality. ShivShaktiji explains this was merely a way to get the message to the humankind so we can use for our welfare.
Depending on your deeds (karma) and bondage with the Divine Mother you will receive appropriate designated protection and Divine Blessings.