Timeline issues in reverse

Maybe the timeline can be worked backwards?

If M-day is the day when Christine and Raoul finally meet in the backstreets of some little port on the coast of Norway (forgetting the time issues with Erik's illness for the moment), then how much time do we need to allow for events before that?
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There's absolutely no reason why Raoul can't set off earlier, especially as we've already established that it probably takes Erik longer to establish a routine of supply runs than it does for Raoul to drift around the Arctic. But it doesn't really work with the idea of doing a timeline switch to cover Raoul's doings up to the point we've reached, returning to send Christine over the mountains, then switching back to Raoul -- not if he would have had to have left before Christine's escape.