As has been mentioned, you're on the wrong track thinking that some amount of time is the same, as or different, from any other amount of time. It is all situationally dependent. No comms for 30 mins in some parts of the US = not a big deal (probably very little happening). Can you imagine being even 10 mins without comms in SoCal or the DC area? YIKES! :eek:

Another way to look at it.
You are ready to come down for your planned descent into ABC airport from the FLs in your GV. If you asked for that planned descent and no one answered you for 15 mins while you drilled along at you current airspeed and altitude - would that be no big deal? ;)

I'd say it would be a big statement to say that there were definitely no traffic conflicts/separation issues (but did say "that I know of...").
Even with all of the gee-whiz gadgetry on-board now we don't always know the big ATC plan you know.

Ten seconds off frequency is a long time if you miss "Go Around".

If you are going to prepare for the worst and do more than just toss a NASA report, the Richie Lengel book has a nice section on handling this sort of problem. There is a limited time window on things like ordering the ATC tapes, so get the book or one like it, and do what it says immediately. Be that as it may, it sounds like an honest gaff and as long as no major fuss was caused I doubt you'll hear anything/ much more. I get queries from ATC every day "would you go on such-and-such frequency and see if N1234 is there?" They have issues with lost comms in geographically large zones. You'll sleep better if you get ready for a call from the FAA though. Many such instances are followed for purely bureaucratic reasons.

FAA seems obsessed with making ATC treat all things not perfect as some deviation these days they need the numbers for funding and when comes down to you or ATC, ATC will put the blame on pilot.
Follow advice here file NASA report read up on the law and write out what you will say if they call you will sound prepared which may help.

Pilot deviation
 

As we know at the FAA its either black or white...so i found this interesting document. Its an extract from an email referring to NORDO aircraft.
" Since the Northwest overflight of MSP a couple of years ago,the FAA is hot and heavy on NORDO's I.E lost comms.
They make us hunt down aircraft like crazy.Since Jan 2012, the FAA has implemented a new quality control system and before a NORDO was handled by each facilty,now we just report the aircraft NORDO and a report is filed as to how long the were out of comms.Those reports go straight to the Regional Quality Assurance office and they determine wether or not to file a pilot deviation.The new standard is 20 minutes.If it is longer than 20 minutes,the Regional QA. Sends the pilot deviation report to FSDO.Not much we can do about it anymore,just make sure talking to ATC every 20 minutes"