Children can practice at home in a similar way with an online timed slide show.
Here's the link for 2nd grade words (47 words)
If you save the powerpoint to your computer you can change the time interval between slides eg to 0:03 seconds (it is set for 4 seconds)
Also available are:
Pre Primer Slide Show
Primer Slide Show
First Grade Slide Show
Third-Grade Slide Show
I like the 'Sight Words Buddy' which parents can download and save onto their home computer. It is not timed but a student could have ,say, 5 minutes to see how many words he can correctly read each day in the same time period. You can click for a score sheet.
The download link is at the bottom of the page: