Well I was bought up there, my family still lives there. I go Blackwall Tunnel then up through Stratford, on a bad day it can take an hour :'( on a good day, like this Monday 25 minutes. Or Rotherhithe then past Mile End Station toward Stratford and on to Forest Gate. Or depending where you live, Honor Oak park to Canada Water, then change to Stratford and 2 stops more to Forest Gate station, bit vague but there it is :))