"To meet that capacity of need, you need two lanes and you need to have about 48 hours to get sufficient trucks in," Stephen O'Brien told reporters.
Russia's military announced a three-hour daily halt of fighting starting on Thursday to allow humanitarian convoys to reach Aleppo, which has been engulfed in heavy fighting.
The United Nations has called for 48-hour weekly pauses for the aid deliveries.
"When we are offered three hours, you have to ask what can be achieved in that three hours," said O'Brien, the UN under-secretary general for humanitarian affairs.
"Is it to meet the need or would it only just meet a very small part of the need?
"Clearly from our point of view, we are simply there to meet all the need and we need to have sufficient capacity to do that."
Up to two million people in Aleppo have gone without running water for the past four days, UN agencies said, raising the risks of disease in a city already devastated by years of fighting.
O'Brien yesterday renewed his call for a 48-hour pause during his meeting with the UN Security Council.
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
