How long will EBM keep in a cooler bag?

[HolidaysQueen]

I'm off to a wedding later today without 20wk DS. I'll need to express 2 or 3 times for the feeds I'll miss, and don't want to throw the EBM away if I don't have to.

Planning to store it in bottles in a cooler bag with an icepack. I'll be expressing at around 3pm, 6pm and maybe another later depending on boobs and then we'll be home around midnight. Will the EBM last this long so that I can put it in the freezer when I get home?

Thanks!

[mears]

Yes it will.

[HolidaysQueen]

brilliant - thanks mears