Negative. 3.5 hours is at max endurance airspeed, probably 50-60 kts and only 3 of those is usable since the FAA requires you have 0.5 available upon landing.
If you have a headwind, which is very commonly 30 knots or more, then in this plane you are barely moving. So, it would be hard to reliably get anywhere at all.
Training flights are mostly in the vicinity of the airport so speed and range matters less. But you do still have to get places (eg the practice area and back) and a really slow plane is going to make a difference in the number of flight hours you need to accomplish the missions.
It's unlikely you'd be moving at max endurance speed if you're going for greatest range. Max lift to drag speed is probably higher, on the order of 70-120knots depending on altitude.
At maximum endurance speed, sure, but that's not likely to be the maximum lift to drag speed. The maximum lift to drag speed of the eflyer2 is 20.6.
If we assume 35% of the in-flight vehicle's mass is batteries and the batteries have a 168Wh/kg specific energy at the pack level (same as the Model 3's battery pack), operating at the EMRAX motor (used for the prototype)'s peak efficiency with a high efficiency propeller, that gives about 400km range.
