Thank you all for your answers.
Really appreciated.

Richard, you said that "fudging the preload is not a proper solution". Could you please suggest what could be a better approach to the problem?
What I "really" need is not to show an increment or a loss of even 1 second while the clock is running for EXACTLY 24 hours continuously.
Of course, if the suggested approach give good results beyond the 24 hours, that's great!

Thank you again for your help.
Regards.
Mike.