Luxury Gel 12" Gel w/Tanglewood Cover

Got mine, third mattress we have bought from Woot! The two previous were both queen size and we are only upgrading to a king this time. But it will be about three weeks before we can lay it out and take the plastic off and let it rise to full size. Is it OK for it to be in its side for a couple of weeks?

The vendor says you should be ok leaving the mattress packed for a few weeks.