Does Time Spent Online have an Influence on Student Performance?

Actually the interest is in the detail here, as (contrary to what the abstract (below) says), it is not clear cut (e.g. they got different results correlating use on Blackboard with results from different types of assessment).
Korkofingas, C. and Macri, J. (2013) Does Time Spent Online have an Influence on Student Performance? Evidence for a Large Business Studies Class. Journal of University Teaching and Learning Practice, 10(2). http://ro.uow.edu.au/jutlp/vol10/iss2/2
"This paper examines, using regression modelling, whether a statistically significant relationship exists between the time spent by a student using the course website and the student’s assessment performance for a large third year university business forecasting course. We utilise the online tracking system in Blackboard, a web-based software system, to extract and calculate the time spent by each student on a range of specific online assessment activities across the entire semester. The evidence suggests that time spent online on the course website is associated with higher assessment performance."
Photo by Sheila Webber: Eastbourne shore, September 2013