Network Enhancement Work In My Area. How long does the work take?

I got this text: 

"Hi, it's Xfinity Assistant.

As a reminder, we'll be doing work to enhance the network in your area starting tomorrow, 03/09. Work will begin early in the morning and our teams will work as efficiently as possible to finish within the day. You can expect service outages at ............ during this time. We appreciate your patience and will text you when work is complete. "

My question is, how long should I expect my internet to be down? I have internet essentials. The 14.95 plan a month. I stream so I'm concerned it'll be out for days from what I have read from other users on social media.

I hope it's no longer than a few hours!! 

Thank you.