[lojban-beginners] How to say "Two months later"

[Matt Arnold <mattarn@123.net>]

I want to say "Two months later I know 11% of the vocabulary" in Lojban. Is it: 
{.i ba'o la'e di'e roi re masti mi djuno lo valsi ji'e li nanacei} 
in-aftermath-of referent-of last-utterance quantified-tense 2 month I know word up-to-limit 11%
Is {ba'o} what I want? It seems that I have used {masti} ungrammatically, but I don't know where to fit it.
-la epcat.

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