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Also, the further the subject is away. The more you have to shift from 1st to 2nd shot. Rule of thumb that I learned was if it's 20 feet and beyond, shift 1 foot. Closer than that means less shift. macro for instance is very little shift. Something a couple hundreds yards away might require maybe 5 feet or somewhere around there, providing your not going for close FG detail. A factor may be a zoom lens as well.
I shot this with a 100-400L...
I kinda stick to the 20 foot rule and work from there. If you do it often enough, you'll start to get the feel for where you need to be.