As infrequently as possible! At uni. in the mid-70s I had a choice between batched Fortran on punched cards and interactive Dartmouth Basic on a Teletype with

As infrequently as possible! At uni. in the mid-70s I had a choice between batched Fortran on punched cards and interactive Dartmouth Basic on a Teletype with eight channel tape. As a lowly undergraduate my Fortran deck had to be submitted to the operator as early as possible to have a decent chance of being run but I was never able to get the results until the day after. After getting "Error in Job Control card 3" or something like that once too often I gave up Fortran and switched to Basic. I had to write more code but I could debug it much more easily and far more quickly with an edit-compile-run cycle measured in minutes instead of days.