"Some in the Foreign Office fear a permanent impasse between the UK and Ecuador, and that Assange will stay in the embassy until 2020, by which time a statute of limitations applies under Swedish law on the rape case."
Its implied 10(?) years in the article
In that case, he's more than half-way there. That doesn't have anything to do with his ailing health, but it's interesting to note.
Per below, yes.
However, England doesn't have a statute of limitations on breach of bail, of which he is pretty clearly guilty. (England rarely has statute of limitations.)
I'm not even sure what the exact allegations are or include. E.g. consensual sex, but without a promised condom might be a different charge.