It's cold outside
Someone experienced in crochet can finish it in less than an hour, but even a beginner, who has used the techniques needed for this before, can probably finish it in less than two.
Schoeller + Stahl Casani (or another super bulky yarn) in two colours.
1 ball (50 m) of main colour (MC), 1/2 ball (25 m) of contrasting colour (CC)
crochet hook 7 or 8 mm / US size L
removable stitch marker or scrap of contrasting coloured yarn
crochet in the round, starting with a magic ring
crochet in spiralling rounds and in rounds
crochet through back loop only