You may already have this info by now. It is from the NREMT and the FL site. It looks like you have 2 years.. Fl also have the same 2 year window (see below)
Entry Requirements (NREMT)
Individuals applying for Emergency Medical Technician (EMT) certification must meet the following requirements:
18 years of age or older.
Successful completion of a state-approved Emergency Medical Technician (EMT) course that meets or exceeds the National Emergency Medical Services Education Standards for Emergency Medical Technician. You must have completed the course within the past two years[/B]. Your Program Director must verify your successful completion of the course on the NREMT web site.
If your initial Emergency Medical Technician (EMT) educational program was completed more than two years ago and you are currently state licensed at the EMT level, you must submit documentation verifying completion of an approved National Scope of Practice EMT refresher course or 24 hours of appropriate continuing education topic hours within the past two years. If your initial EMT education program was completed more than two years ago and you never gained state licensure at the EMT level, you must complete an entire state-approved Emergency Medical Technician (EMT) course prior to applying for National EMS Certification.
Emergency Medical Technician (FL)
To be eligible for Florida EMT certification, an applicant must:
Submit a completed application
Submit proof to the Certification Unit of meeting the required professional education in one of the four following ways:
Florida Training - Successful completion of EMT course from a Florida Department of Health approved program listed on CE Broker within the previous two years. You must submit a copy of the course completion certificate, if your course was taken more than two years ago it will not be accepted;