You basically have four options.
If you live in an area that can pick up Radio Sheffield on a radio, I'd treat yourself and buy yourself a radio, you've still got 5 hours.
If you live outside the Radio Sheffield area, you can subscribe to Blades Player. This will allow you to listen to the commentary but, as it is usually about a minute behind, you will probably see what is happening on twitter/shoutbox/sky sports news before you hear it.
You can search for anyone streaming radio coverage - there is often a stream done by Paddys the special kid off of Bladesmad - he usually posts a link on there or his twitter. There are sometimes radio streams on the exiled Blades Facebook group too.
Or of course, you can fuck off the Radio, get out your crayons, prep your shoutbox bingo card and join us single cells in the match day shoutbox and follow
Foxy and
Linz on twitter for real time updates of us wasting another set piece.
I'm a big fan of option 4.