(How SCCA club racing works, and why crew is good)
Racing consists of an endless amount of prep work done as quickly as it can be dome perfectly. This is followed, after the registering and entering by organizing, packing and loading the contents of the garage and driving for a few hours by reversing the process after jockeying for paddock space that's not in a drainage culvert, along with more waiting in line, registering, and dealing with some potentially very particular tech inspectors. Practice day often discloses potential weekend-ending problems to rectify, and the driver is under the gun to get up to speed immediately without breaking the car. Between sessions the car comes apart and is adjusted, fed, inspected and maintained. At the end of practice day the car is made ready for qualifying day, the paddock spot is partially packed up, and you get to leave 'til you come back at dark:30 the next day.
If you've done everything right, Saturday morning is your easy time. Warm up the car, check fluids, nut and bolt everything again, lay out the driver's gear, get the pit ready for rain if needed, fret, worry. Eventually qualifying will happen, after which, if the car isn't broken you can repeat the same prep done Friday eve/Saturday morning. It's likely you'll have time to kill if there's no sh1tstorm of activity thrashing a broken car back together. Eventually a qualifying race will happen after which the car prep happens again. Typically there's plenty of time, again, given an unbroken car. Sunday, Sunday, Sunday! - The lottery of run group order can help or hinder. If you're not racing 'til after lunch break and car prep was done Saturday before you left you can "sleep in". Arrive at track, bodywork off, check fluids, nut+bolt, inspect carefully, wipe down, bodywork on, give it a quick shine, lay out driver's gear, be ready for rain if necessary.
Eventually there's a call to grid followed by a race. The car will most likely finish in some position. After release from impound the driver will be a jacked up, insufferable bundle of nerves and enthusiasm, an angry belligerent prick, or a mopey, sobbing mess. It's also possible they'll either be called to race control for punishment or brought to medical, in which case you'll have to receive the broken, leaking, doesn't-roll-anymore car from emergency services and break down the paddock spot and pack the trailer, where once back home you'll reverse the process again and get ready for a month of working on the car.
If you're "crew" it's your job to know how to do whatever parts of this process that are your responsibility, and to anticipate where your assistance is needed, preferably in advance.
If you're team manager, crew chief, driver and crew - you're busy.
When it actually works, on the basis of support time to operational time - it's more labor intensive than operating a WW2 radial engine aircraft - but it's a life experience that's worth whatever it costs.
I'd give up a kidney for a dedicated crew person.