Saving can be a countable noun, or a plural one. Used countably, a single saving can be made: I made a saving on electricity costs when I changed to LED light bulbs. Also multiple (plural) savings can be made: The company made savings of time, money and staff use when it computerised a process.
It will be a much simpler procedure and over a period of years will result in considerable savings of time and expense to the Government.1
Saving: plural savings
1. countable noun A saving is a reduction in the amount of time or money that is used or needed.
Fill in the form below and you will be making a saving of £6.60 on a
one-year subscription. [+ of]
...a program of household savings on energy use.
Note there is also a plural use:
- plural noun Your savings are the money that you have saved, especially in a bank or a building society.
Her savings were in the Post Office Savings Bank.
...a savings account.
Thus, addressing your example text:
That move might mean a saving in time.
That move might mean a saving in money.
That move might mean savings in time and money.
1from Decisions of the Comptroller General of the United States, Volume 26
U.S. Government Printing Office, 1946