Old Madeira Service & Pairing advice

I have friends planning to open a bottle of 1920 Blandy's Bual next week and have asked me how long it would keep once open. I get the impression they would like to stretch the bottle over as long a time frame as possible, though I'm unsure that they have a Coravin.

It makes sense to me that it should last quite a while once open, but that it also might be best consumed within a few days of opening. If anyone has experience serving Madeira this old BTG, both conventionally or with a Coravin, I would appreciate some advice. 

Also looking for any unconventional pairings anyone has enjoyed with old Bual.

Thanks

Kurt

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