speaking as a CFII who performed many introductory/ discovery flights. I always used to time to do a little salesmanship of my flight school's selling points and my services as well, I wasn't building time, but actually training new pilots interested in aviation either for fun or business, career. You need some flexibility, but you need a school that can work with you on your schedule. My introductory flight was to have the newbe fellow me through a walk around, get them seated in the left seat and run the checklist for start up and let them taxi, I handled any radio traffic / tower calls. Get them lined up on the runway and talk them through the take off and climb, me doing most of the rudder work, but them applying back pressure and me trimming, take them out to do some sight seeing and talk the through the four fundamentals. Talk them back into the pattern, and using the four fundamentals Land. They did 90% of the aircraft control manipulation, I just keep it safe. Most not all, signed up. If you want a career. Do what I did, save your money, go to a flight School in an area where you can fly every day, I flew twice a day, every day 7 days a week and came away in 6 months with Commercial, Instrument, Multiengine, CFII, Multiengine CFII. My first job as a commercial pilot was towing banners up and down the Jersey shore. I flew for two airlines, Monmouth Airlines out of KBLM and got picked up by Eastern Airlines out of KEWR. When Eastern went belly up I started my own Aviation company and supplied pilots and pilot training to Corporate aviation departments. I ran my own business for 38 years until my wife passed away, Sold the business and I'm still an active CFII. I loved teaching flight,, passing on the knowledge. Good Luck.