First, you can put an @ in the on JOIN line so that you don't need the check to see if you're an op.

Code:
on ^@*:join:#: {


Second, please use the CODE tags around code so that it's spaced out and easier to read.

As to your question, set your variable for 60 seconds and put a check in each event... if the variable is set, then haltdef the event.

Example:

Code:
on ^@*:join:#: {
  if (%JPHOLD) { haltdef }
  ; Put the rest of your script here.
}


Do the same for part and quit events as well.

You can use this to set the variable rather than using a timer:

Code:
set -u60 %JPHOLD On

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