Is there a cut-off time when the agents either at the Crown Lounge or the Transfer Desk cannot process DoD Upgrades?

I am a Delta Diamond member and have been able to upgrade using SkyMiles+cash on all but one of my KLM long-haul flights, but have always made sure I had a long enough layover time in AMS to get to the CL and get it handled.

I have two upcoming flights that only give me 1hr 20m layover and I'm wondering if this is enough time to run to the CL and try and get a DoD Upgrade processed.

Any experiences with this?

Thank you!