You must practice it at regular intervals.

It was a dark and stormy night; the rain fell in torrents — except at occasional intervals, when it was checked by a violent gust of wind which swept up the streets (for it is in London that our scene lies), rattling along the housetops, and fiercely agitating the scanty flame of the lamps that struggled against the darkness.

If you concentrate, you'll be able to finish within a shorter time interval.

However he has to take it at fixed intervals, just one day without taking it is swiftly fatal.

There was a two hour's interval to the next train.

Negating the assertion requires a negative augend, but all augends are products of factors on the unit interval.

There was a long interval before he replied.

As is the wont of seamen, to beguile their toil one of them sang a song, in the chorus of which the others joined at intervals.

I visit my friend's house at intervals.

The active volcano erupts at regular intervals.