Try this one.
you can adjust the "VAR1" to change on time.
To further increase/decrease change capacitor (C1) value.

[![enter image description here][1]][1]


[Proteus simulation file][2]


  [1]: https://i.sstatic.net/2rfdx.png
  [2]: https://www.dropbox.com/s/n035fajmxt8pyf5/push_delay_off.DSN?dl=0