Full time is when a talk group is set as the default the particular band or time slot will repeat. That can be "hard coded" by the sysop so that it's "permanent", i.e. no one can change it, or it's limited to a specific set of talkgroups, or no limits at all. Users in the field select a talk group by entering in the node/repeater/talkgroup (depending on the protocol, DStar, DMR, etc) then transmitting, hence the name "PTT".
With your own hotspot you can set up whatever you like, including multi-mode if you want (MMDVM).
Mark K5LXP
Albuquerque, NM