expression, adverb
for a while; for some time; for the time being
Indicates a temporary period, often with the implication that the situation will change later. Used in both spoken and written Japanese.
しばらくの間、ここでお待ちください。
Please wait here for a while.
しばらくの間は、この状態が続くだろう。
This situation will probably continue for some time.
しばらく alone is more common and casual; しばらくの間 emphasizes the duration or temporary nature more explicitly.
当分 also means 'for the time being' but often implies a longer or indefinite period, and is slightly more formal.
Combination of しばらく (for a while) + の (possessive particle) + 間 (interval, period). The phrase literally means 'during the interval of a while'.