With BIAB you mill your grains so fine that conversion occurs in ~15 mins. I don’t have any temperature loss in that amount time (with kettle wrapped /insulated). I get about 2 deg loss over 90 mins. It’s why a mash pump isn’t needed for eBIAB.
It’s been discussed many times on here with general consensus that recirculating / or trying to actively control mash temp is a pointless with BIAB. E.g. https://www.homebrewtalk.com/forum/threads/biab-mash-recirculation.624223/
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