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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.
4 months ago on Moffat on Why Hurt to Eccleston Regeneration Was So Short