I had the same problem with my Travel Time. You can set the time units to 45 at game start. It is operator selectable from 45 to ? units in increments of 15 time units if I remember correctly. There is a row of Jones Plugs under the time unit stepper. Move the male plug to change the default value of the time units at game start.

You can also increase or decrease the time of each time unit by changing the pot on the small PCB under the front of the playfield. It is a fun game when dialed in correctly.

I’m going on memory here so I could have a fact or two wrong.