In order to calculate the time it takes to reach herd immunity, the basic reproduction number R0 is required.
However, the graph does not seem to be officially available, so I tried to work it out myself assuming 3, 4 and 5 days as generation time (Figure 1 'Effective reproduction number R 3-5d Malaysia'). The corresponding R0 value was 6.6, 6.7 and 7.9, respectively.
If we take R0 (4 d) and compare it with Germany, for example, we notice that the value obtained for Malaysia is 2x greater than reported for Germany (Figure 2 'Effective reproduction number R 4 d Germany'; https://www.rki.de/DE/Content/Infekt/EpidBull/Archiv/2020/Ausgaben/17_20.pdf).
Is this possible that the R0 value varies due to geographical, cultural or genetic reasons, or does it depend on the testing approach, or is my calculation simply wrong (Figure 3 'Example of R calculation')?