Professionals plan to take an average of nine vacation days this summer but most will still check in with the office, according to a survey by Accountemps, a division of Robert Half International Inc. (NYSE: RHI).

The survey found 44% of respondents said they typically don't check in at all with the office, down from 47% in a similar survey last year and 59% in 2016. Seventy percent of this year’s respondents ages 18 to 34 will maintain some contact with work, compared with only 39% of those ages 55 and older.

The frequency of office check-ins varied by market.

• Never out of office: Nashville, Dallas and Los Angeles lead in terms of the number of workers who plan to take no summer vacation.
• Checking in constantly: Employees in New York, Charlotte, Los Angeles, Miami and Seattle are most likely to connect with the office at least several times a week.
• Leaving town and never looking back: Professionals in Cleveland, Minneapolis, Denver, Philadelphia and Salt Lake City are best at disconnecting from work while out of office.

“Employees need time away from work to rest, relax and recharge,” said Michael Steinitz, executive director for Accountemps. “Yet for an increasing number of people, totally disconnecting from the office can have the reverse effect and add stress.”

Steinitz noted that some workers enjoy greater peace of mind when they allow themselves to check in a few times — but not much more than that — while on vacation. “Doing so confirms that all is well, which allows them to stop worrying and focus on relaxing instead,” he said.

The survey was developed by Accountemps and conducted by an independent research firm. It includes responses from more than 2,800 workers in 28 US markets.