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In a similar experiment, this time comparing one or two blocks of practice, we see that overlearning is perhaps slightly more effective than distributed practice if the test is in one a weeks time, but significantly less effective if the test is in 4 weeks time.
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Rohrer, D., & Taylor, K. (2006). The effects of overlearning and distributed practice on the retention of mathematics knowledge. Applied Cognitive Psychology, 20, 1209-1224.
timely practice says
In the experiments the distributed practice was only separated over 2 sessions, with timely practice we distribute the practice over many more sessions and over a much longer time period. Overlearning, retrieval practice and timely practice mp4 Please see this video for a fuller explanation https://timelypractice.atlassian.net/wiki/spaces/CKB/pages/53046503/retrieval+practice+or+spaced+learning#Spaced-learning-explained-by-graph