Background and aims: Maladaptive Daydreaming (MD) is a suggested syndrome where individuals become addicted to fantasizing vividly for hours on end at the expense of engaging in real-world relationships and functioning. MD can be seen as a behavioral addiction. However, a paucity of longitudinal research means that there is no empirical evidence confirming the stability of this alleged addiction. Moreover, the direction of its association with psychopathology is unclear. Methods: We examine, for the first time, long-term stability and longitudinal associations between MD, psychological distress (stress, anxiety, and depression symptoms) and COVID-19 related exposure. Results: Participants (N 5 814) completed an online survey twice, with a lag of 13 months. A two-wave structural equation model demonstrated high MD stability and positive cross-lagged pathways from MD to psychological distress. COVID-19 related exposure was not a longitudinal predictor. Discussion and conclusions: MD is a stable condition and a risk factor for an increase in psychological distress.  Kulcsszavak: maladaptive daydreaming, psychological distress, stress, anxiety, depression, COVID-19