Almost 24 hours (in 2 hours it will be 24hrs) and the mattress is very firm and the coils can be felt poking through the top layer is very thin like very thin its like a sponge on top of springs if you lay on top you can feel them the card said to wait 72 hours will be back when the time is up and will update.

Assembling the box spring is fairly easy. I liked the box spring but will need to return it because the dimensions are smaller than the mattress so it hangs out on the sides. This box spring is 53x74x9 and the mattress is 54x75 so make sure that matches when purchasing.

I could be prematurely reviewing this, meaning it probably is a good a box frame. However, putting it together was very difficult. The directions coupled with the way the pieces were labeled were hard to read and the screws were very finicky when assembling, even with a drill. So again, my rating is not based on the quality of the product but rather on the assembly.

it fits my queen bed perfectly, so easy to assembly, so much convenience, I couldn't happier, so glad I didn't order wooden box from furniture stores that I called around asked for price. it's more expensive, plus delivery 45.00 within 5 miles, and not easy to move around. Just perfect.

I'm a 78yr old mechanically skilled arthritic, the most difficult step was bringing the box in and making myself follow the directions. Pros: Best directions I've seen in years. Excellent small parts package, well marked, even the spares. Good provided tools. All the parts fit!!! Cons: Nothing of consequence, the cross bars are a "snug" fit, I tapped them in with a rubber mallet. Total time from box opening to setting the mattress on top was just under an hour and a half.

We had the queen 9" boxspring together for about a week. Today one of the center supports fell to the ground. It pulled apart somehow and does not go back as it should. Currently using zip ties to hold it together and adding more support underneath tomorrow.

This Box Spring needs some assembly. My wife and I are 73 years old and had it assembled in less than one hour. This item is the best "thought through" assembly I have ever seen. You will literally never have to replace this box spring. 1st class parts from beginning to end, looks great, and will perform great. I promise it will surpass all of your expectations.

The frame pieces could?ve been labeled and the fabric cover could?ve been a little bit bigger. The pieces that like hold the mattress just lock in. Sorta wished there was at least the option to screw them into place. All in all it does its job, fits our frame well. Very firm sadly but that?s my bad for not realizing that it wasn?t an actual box spring.

A put together metal frame that took me about an hour to assemble on my own. I was expecting a regular box springs. Maybe it's time to move on from that. With a king size it's a 9" platform which mashes the bed a lot higher than expected, but seems super comfy if you like a firm bed. Jumping up into bed might be worth the $100 we saved over a serta box springs

The instructions a bit confusing but overall the BoxSpring is great. One issue the rails will come out and do not really fit snug and the COVER does not fit. I called Zinus and they are giving me difficulty be careful and if you order online they will not accept purchase history as proof of purchase and Reps are rude.