run lisp every hour
Do some Searching in this Forum. Things very like this have come up before, though mostly in relation to Saving in various ways [for example, to periodically Save to a different version, or to a .DXF file, unlike what AutoSave functionality does]. You'll find all the discussion of possible approaches, the difficulties inherent in the idea, etc.
@Activist_Investor wrote:
Does that include when AutoCAD is running but no one happens to be using it (e.g., int the background, or the computer itself is not being used) ?
That's one of the "difficulties inherent in the idea" I mentioned. If you have multiple drawings open, and some of them have had nothing done in them for the past hour, should it run in all of them anyway? If you've switched over to Internet searching or Word processing or Spreadsheeting or something, and AutoCAD is just sitting there doing nothing for an hour, should it run anyway? If you've gone to a meeting....? Etc., etc.
@john.uhden wrote:
.... There has to be an event that triggers the reaction. It could be any command .... we ought to test out using TDUSRTIMER and see if it really slows things down ....
One possibility [similar to but I think simpler than creating a Reactor] is to Undefine and then make a new definition of some commonly-used command, add a check on TDUSRTIMER for whether it has passed an hour [0.041666 days], and if so, run the routine, including resetting the timer with a Time command, and then proceed with the requested command; if not, just proceed with the command.
But it kind of depends on what the routine should do. For instance, I like to work with Blips turned on, which means I use Redraw occasionally, and since that doesn't involve any further input, redefining that to include such a check would be "invisible" to the User if the routine doesn't make any requests of them, and wouldn't interrupt anything. The same might be done with other transparent-capable commands, but some of those [like Zoom and Pan and Layer] are more commonly done in newer versions without the commands themselves, e.g. mouse-wheel display manipulations wouldn't trigger it if it's embedded in a new definition of the Zoom command. But if whatever it should do involves commands that can't be transparent, and/or it has to get User input or confirmation or something, then you would want to think carefully about which command to redefine, e.g. would you want to start a Line command and have it occasionally interrupt, and ask for input about something else? In such a case, should it ask first, or after you've drawn your Line(s)? Etc., etc. It would presumably have to be some command you use often enough that it's likely to be triggered after not much more than any given hour's time. The best candidate would depend on the nature of your work, e.g. do you Insert Blocks or draw Polylines more often than you draw Lines?
That kind of approach has the advantage that even if you have several drawings open, or you are using other programs for a while, or go out to lunch, those drawings in which nothing happens for a long time won't have the routine run in them unnecessarily. But there is the potential that some drawing was getting close to the hour cut-off, and ought to have the routine run [e.g. for safety if it involves some kind of Saving], but wouldn't have it run until you get back into it and do the triggering command again. That means if, for example, AutoCAD crashes, such a drawing won't have had it run, and [again if Saving is involed] work could be lost.
@DGRL wrote:Dear members,
Is it possible to run an lisp automatically every 60 minutes for example?
IF possible can someone provide me an code?
Best regards,
I think it would be a good idea for some participants in this thread to try to avoid confusing puzzles with problems (e.g., in this place, a puzzle is a problem that must be solved entirely with LISP, without the aid of any other type of programming/scripting etc.). IOW, it's a game of sorts. 
You came here with a problem, not a puzzle.
The problem can be easily solved, using just about any Windows development tool, like VB, .NET, etc., and it would take about 10 minutes to write (specifically, an ActiveX client that uses a Timer as a trigger to send a command to AutoCAD that executes the LISP macro). And yes, it can do that as often as you want, and it can also be done intelligently so that it waits until AutoCAD is not busy, rather than being disruptive and interrupting you while you're using a command.
I'm not going to write it for you, but you should be able to find someone who would be willing to do that or may already have done so, perhaps in one of the other forums that deal with Windows development tools (try the VBA/ActiveX forum, or the .NET forum).