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@GeoffreyFoster David Tennant wandered for an undisclosed amount of time without a companion between the fourth season finale and his final regeneration episode. During that time a couple episodes (like Water of Mars) took place, but when he finally shows up to meet with the Ood that gives him his death prophecy, he mentions a bunch of off-screen adventures (A one off joke here about Elizabeth I not being the virgin queen anymore implies that the 50th anniversary episode took place during this time from his perspective.) That could probably make up for the missing 90 years.
11 months ago on Moffat on Why Hurt to Eccleston Regeneration Was So Short