On a 240v circuit of at least 20a the Dudosa should be about 3x as fast as the OEM 120v 12a Leaf EVSE. Note the Dudosa should also be capable of running off 120v(16a) if you make an outlet adapter, 120v standard male plug, short piece of 12g minimum, quality 3 wire cord and a female plug the same type as is on your Dudosa. Note your outlet will need to have a 20a breaker and #12 wire and be in good working shape but even on 120v you should get around 25% faster charging than the OEM Leaf EVSE.
Note I'm assuming your Dudosa is the very common and cheap 16a model, if not everything will be different.
2012 SL purchased used 2/'16
2013 S w/QC purchased new
Juicebox Premium 60a L1/L2 EVSE, Ebusbar 16a L1/L2 EVSE
'12 EVSEupgrade'd 20a L1/L2 EVSE, '13 EVSEupgrade'd adjustable 6-20a L2, 6-13a L1 EVSE
Zencar 13, 20, 30a L1/L2 portable EVSE
GE Durastation 30a