The people who avoid regularly tuning their pianos will often start to notice the difference very rapidly. This will certainly be the case for the instrumentalists who have a very full piano playing schedule.
Some Piano Players Will Need to Get Their Pianos Tuned More Frequently Than Others
Many of the people who use their pianos more casually might be able to get them tuned a couple of times a year. Professional pianists might actually have their pianos tuned on a couple of separate occasions every week, especially if they're getting ready for recitals or recording sessions.
The companies that create and design pianos will sometimes say that piano players should make sure that their pianos are consistently tuned a few times a year. Experienced piano players may just decide to have their pianos tuned whenever they feel that it's necessary. These individuals may use both newer and older pianos.
New piano strings sometimes need time to get somewhat more stable. The strings of older pianos may have deteriorated somewhat, but proper tuning could still be helpful for the older piano itself.
Older Pianos Can Be Fixed Even If It's Been Years Since Someone Tuned Them
Some tuning professionals have managed to restore pianos that were left unused for over a decade. However, those pianos will often need new components. The piano keys and strings might not be as mobile by that point. Professionals will have to handle these pianos carefully since they could damage the piano strings further by tuning the older piano too quickly.
Those pianos might have to be delicately tuned every few months over the course of a full year. Many of those pianos will truly be in good condition by that point. Professionals will use many different tools and skills to make this possible for piano owners.
Specialized Electronics May Be Useful for Some Tuning Experts
The tuning experts who are trying to work on older pianos will often have better results if they make use of some of the electronic tools that are available today. These pianos will typically have degraded strings, and the piano strings might have very different flaws than newer strings typically have. The tuning experts who will often primarily use their listening skills might still struggle in these instances. However, these professionals usually have so much experience with tuning different pianos that they're able to solve issues very smoothly and maintain pianos efficiently and quickly.
For more information on tuning pianos, consult a piano tuner in your area.