This is easy to do using IOL.
If you change the target attribute of the editform form to point to an iframe when the form submits it will submit to the iframe rather than reload the page and you can continue to edit the form from exactly where you left off (because the page never reloaded - you are still on the same form). If you additionally reload the page at some interval less than 60 minutes you can defeat the time out.
The code would be similar to what is in this pastie:
What is the "Play the Field" Technique?https://haversineconsulting.quickbase.com/db/bgcwm2m4g?a=dr&rid=413
