'within a promised time' is correct and usable in written English.
You can use it to refer to a time frame that has been agreed upon. For example, "The repairman finished the project within a promised time of three days."
"We do have some delays and some are done on time," says the spokesperson, who is unable to answer whether the majority of orders are delivered within promised time frames.
Most significant, Webvan promised to arrive within 30 minutes of its promised time while Peapod and others specified only a two-hour delivery window.
My breakfast ($24) arrived within 10 minutes of the requested time but was missing a promised croissant, and milk for my tea.
Determined to keep real estate speculation at a minimum, the government implemented new laws in 2008 and 2009 requiring that deposits from buyers of off-plan properties be held in escrow; buyers would be entitled to a refund if the developer didn't hand over the promised property within a certain time frame.
It added a work component, requiring recipients to find employment within a proscribed time period, and promised to "end welfare as we know it". And it did.
This means that the throughput guarantees cannot be promised within time-windows with a different duration or a different placement than that used by the algorithm.
We head upstairs and arrive within the promised 30-minute delivery time with a minute to spare.
For instance, take a promise to convey land within a certain time, a court of equity is not in the habit of interfering until the time has gone by, so that the promise cannot be performed as made.
Most construction loans now also require a completion guarantee, where the borrower promises construction will be completed within a specific time frame.
