When positioned and awaiting a convoy to pass, I have never had any problem staying at periscope depth with periscope raised. If you are at 0 knots, the scope doesn't create a wake and is virtually undetectable, even during the day, even with the "better escorts" mod with more sensitive detection. (Note: I don't keep the scope fully raised, only high enough to just break the surface).
Personally, I need that time to match my solution to the observed target, particularly since the range finder is still a bit off using imperial measurements. Once I fire my torps, I keep my engines off and just drop-dive to 250, below the thermal layer, then I turn my engines on 1/3 and creep away. The destroyers rarely have a clue.
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