Pump At Work

Hi mga moms, babalik na ako sa work tomorrow and nagwoworry ako about pumping ng breast milk sa work wala kasing fridge/freezer sa office. To those working mommy na may same case ko can you please share how do you store your breastmilk habang nasa work? Ilang oras itatagal kapag wala sa fridge or freezer? Thank you in advance sa help.