Webster's Revised Unabridged Dictionary · 1913

Betime

Betime ({not transcribed}) , adverb

[Prefix be- (for by) + time; that is, by the proper time. The -s is an adverbial ending.]

1.
In good season or time; before it is late; seasonably; early.
To measure life learn thou betimes. — Milton
To rise betimes is often harder than to do all the day's work. — Barrow
2.
In a short time; soon; speedily; forth with.
He tires betimes that spurs too fast betimes. — Shakespeare

Also: Betimes