so I need at least 90 ft for each electromagnet?
Yep, if you use that fine gauge wire. Much more for heavier gauge wire.
However, the resulting 30AWG wire coil will be giving off (1.2A)^2*9.2 Ohms=13.2 Watts of heat, and will smoke rather handsomely before (perhaps) burning up completely.
The maximum current for point to point wiring or power transmission is discussed in this wire table. It is not trivial to design and operate an electromagnet.
Edit: it does not appear that the Adafruit motor driver can do automatic current limiting, which can be used to control power consumption and heat generation. The Pololu stepper drivers can.