Human performance shows substantial endogenous variability over time. Such variability has been known to show temporal structures: Performance from action to action is not independent, but shows correlation with itself over time. While the existence of such dependencies has been frequently reported on, its measurement and interpretation come with a number of controversies, and its potential benefit for studying individual differences remains unclear. Two recent studies have linked temporal structures to individual differences in task performance, but with contrasting results. In the current study, we aim to investigate the intra-individual repeatability of these temporal structures in endogenous performance on the Metronome Task (25 participants, tested in two sessions ~45 minutes apart). Secondly, we examine the inter-individual correlates of the temporal structures (83 participants), specifically looking at: 1) task performance, 2) meta-cognitive ratings of attentional state, and 3) self-assessed personality traits (ADHD tendencies, mind wandering, and impulsivity).Rather than using one analysis method (as is common in the literature), we consistently compare all the frequently-used analysis methodsallowing us to investigate the structures without an a prior assumption on the underlying time scales.Results indicate that autocorrelation at lag 1 and Power Spectra Density slope showed the most intra-individual repeatability, ARFIMA(1,d,1) parameters showed the least, and evidence for Detrended Fluctuation Analysis was indeterminate with a moderate effect size at best. Overall, the autocorrelation at lag 1 seemed the best measure for studying individual differences, due to its high reliability and ease of use. Furthermore, with exception of the ARFIMA parameters, temporal structure was correlated with performance but not with subjective attentional state or self-assessed personality traits between participants.