Two hours ______ a reasonable amount of time for the task.

"Expressions of time and distance" কে "single entities" হিসেবে ধরা হয়।
- এজন্য এদের পরে Plural Verb না হয়ে Singular Verb হয়। যেমন:
- twenty miles,
- six days,
- two minutes,
- four meters etc. - all take singular verbs.
 
Complete Sentence: Two hours is a reasonable amount of time for the task.

Example Sentence:
1. Ten dollars is the cost of admission to the museum.
2. A hundred pages is a substantial length for a novel.
3. Fifty guests is a manageable number for the event.
4. Fifty miles is not a long distance.

Source: Applied English Grammar and Composition by P C Das.