After some more tries it seems you need a running time of about 4 minutes to have enough time to get away from the escorts undetected. During one attack running time was 250 seconds (range 3600m) and I got away, could see the escorts behind me at medium range throwing depth charges. During another attack running time was 220 seconds (range 3170m) and I was detected.
So you need to be about 3500m outside the convoy and need about 4 minutes to get away. I'm sure this depends on various factors and varies per attack. But, a succesful surface attack at night with electrics is possible, although the margins are fine. If you overestimate the range you're in trouble.
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