Answer:

uptime

Answer	Crossword Clue
UPTIME	Hours spent working
UPTIME	Hours of operation
UPTIME	Period when a computer isn't down

UPTIME	Working hours
UPTIME	Computer's running hours
UPTIME	When technology is working
UPTIME	When equipment is functioning
UPTIME	Operating period
UPTIME	Computer-at-work period
UPTIME	When computers are working
UPTIME	Computer availability

UPTIME	When surfing is possible?
UPTIME	Hours of operation?
UPTIME	Period when a computer is functioning
UPTIME	When computers work
UPTIME	When a computer is functional
UPTIME	Computer-is-working period
UPTIME	Functioning-computer period
UPTIME	Span between reboots

UPTIME	Productive period