If you are on a well-marked field and the LJ is aware of the LTG he can do a lot to help reduce the number of necessary measurements. If he squares in like he's supposed to he can come in a half yard short or just beyond the LTG depending on how he feels the play ended. If it's too close to call go with what you have and measure. It's no different than making a ruling at the goal line or a runner going out of bounds near the LTG.
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