The Open Water Diver certification has 3 segments, Academic, confined dives (pool exercises) and four open water dives.
The PADI E-Learning option gives the opportunity to complete the academic portion online at your own pace.
Upon completion, no need for reading or exam. This also saves vacation time.
Upon completion of the E-Learning, only confined dives and four open water dives are needed. This can be done in 1 ½ days or 3 half-days.