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Hi and Welcome-
It is difficult to be sure if your daily movement is enough to keep your watch fully wound. It's a tough thing to quantify.
I am unsure of the exact power reserve spec on a 16800, but assume it is in the 42-48 hour range. Whatever the number is allow that it is probably a little optimistic. They are rated on a new watch in perfect mechanical condition.
Why not do a simple test? Set your time and date to numbers you can easily reference. Wind your watch 40-50 turns and put it down. See how long it runs on its own with no movement. This will tell you your real power reserve.
I would consider anything about 36 hours or more to be quite good. Significantly less might indicate a mechanical problem.
If it turns out all you have to do is wind your watch every three to four days, I would consider that a great alternative to an expensive service.
Mark
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