"while spending" is a valid phrase that can be used in written English.
For example, "He enjoyed himself while spending a few days at the beach."
All the while spending more time in the hustle and bustle of the front court.
"So, we think it's worth our while spending the time working on the underlying infrastructure".
They grew close while spending their first trimester together.
"They're selling more cars while spending less money on incentives".
While spending numerous hours in the library, I gained hope and inspiration from that sentiment.
Discovered this blog while spending some idle time on the internet.
After graduation he continued to play baseball in Maryland while spending two years in medical school.
The Mets win at about the same rate while spending far, far more.
"It has gambled away public trust" by pledging to cut taxes while spending more.
Premiums totaled $849 billion in 2010, while spending on benefits totaled $746 billion.
Nationally, household incomes tripled, while spending increased by a factor of 2.4.
