Lifelogging is the process of automatically, ambiently and digitally recording episodes of one's life experiences. NTCIR-12 Lifelog test collection was initially created, as support for the Information Retrieval (IR) community, to develop new and novel lifelogging retrieval and visualisation systems. In this paper, our goal is organising and analysing the NTCIR-12 Lifelog dataset by using a time series approach to facilitate automatic discovery of repeat events.