How to go back and do a section without redoing whole project

I was doing anf ingrave and cut. When it got to a section wherer there was some writing it didn’t engrave some of the lettering completely and it was towards the end of the project. How can I get back to just that spot and redo the engrave without having to turn off laser and wait for it to get back to that section to turn laser back on? It’s a 90 minute engrave.

In ‘Preview’, scrub to the spot you want to redo, then click the ‘Start here’ for options.

Thank you.