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They'll survive but you could return to nipped fins.
Has anyone tried the Tetra gel vacation feeders? I know those pyramid things are awful but then I saw the gel discs and wondered if they might be better? There are also timed dispensers that may be worth considering if this will be a semi-regular occurrence.
IMO the gel feeders are still a potential point of failure and the auto feeders can be too. Just a risk that I wouldn't take personally. I used to routinely leave 8-10 tanks unfed for up to a week at a time with no ill effects. If you add any food during your time away, you'll want to do a good PWC before your departure and as soon as possible on your return.
I went to Australia/New Zealand for 18 days...the house sitter completely forgot to feed my 3 tanks for the entirety of the trip....came back horrified and scared to see the damage...and surprisingly, no casualties! So 4 days? Piece of cake
Yes they'll be perfectly fine. Don't add any vacation feeder blocks.. They're full of fillers and preservatives. I left one in my tank for 10 days once when I was on a trip and when I returned the fish had not touched it. They didn't even know it was food. And they were all fine.