It appears the attorney miscalcualted the time - and if he was not sure, he should not have given an "estimate"
Because your husband took a plea, he is unable to appeal. HOWEVER, he can file a Post-Conviction Motion - based on the attorney's inaccurate advice. A post conviction is a process that would be difficult to do pro se because it involves a Memoradum of Law citing case law that pertains. So when you consult with legal attorney's mention the Post Conviction.
Best to both of you,
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