Jiffy pellets aren't my favorite seed starting option. You can grow things in them but they aren't that stable when your seedlings get some growth and you need to transplant sooner than you do with seeds grown in flats.
You didn't say what you had planted or how fresh the seed was, but if you Google germination time it's easy to find tables that tell Yo 7-10 days at 75 F or something similar. Older see dwill take longer and it all reaches the point where germination rates are low to no germination at some point.
Jiffy plugs shouldn't alter germination times but how moist they're kept, temperature, and if they're covered to retain humidity can all effect germination times. If you only start a few plants a year there might be a role for them in your garden. If you start enough seed that you have considered heat mats and or grow lights you'll probably just want to order some trays ans inserts from a greenhouse supply store and use a good seed starting mix.
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