Is it rude to ask a hairstylist how long a style will take?

So for contexts I'm an African American teen with relatively curly like 4b-4c hair. I've been to a few different hairstylists but more recently like the past three times I've got my hair done I've gone to one specific hair stylist. She's very nice and does my simple Style very well it always lasts and looks quite neat (just basic cornrowns mabey some curls on the end). And as I'm still a minor my parents have always been the ones to book these appointments, I help with payment but it's easier if it's just through their card cuz that's already how the website is set up. So I have a party to attend for a friend who's going to be moving away like multiple states away so this is probably like the last time I'm going to be seeing her for a while in person and it's scheduled the same day that I have to get my hair done just like later in the day. For someone context I come with my Hair washed and detangeled but the stylist handles the straightening and then braiding of my hair adding in some extensions. The times that I've gone to this hairstylist it's taking her about 3 to 4 hours to complete the style that all factors in that a lot of the time tge appointment starts after the scheduled time just because she goes over with another client. Which is really not something I mind because most days I'm not doing anything on days when I scheduled to get my hair done but on this specific day I'm not in a rush per se just really kind of like to know the timeline so I can message the people at the party I'm going to just to know when to expect me. Obviously I don't want to divulge all this to the hair stylist because it would be rude to ask her to hurry up her styling on account of me I just wondered would it be rude to let her know that I have an event to attend later that day and would just like to know an estimate of how long she thinks the style would take? I don't want her to feel rushed at all but it's just I with a few other people are planning to help set up and Host this party so it's kind of important for me to know what time I'll get out of there so I know if maybe I should step back in my hosting duties and just be a guest or if I'm still okay. I don't want to make her feel uncomfortable like I think her service is slow or bad because I don't she's really nice. So I asked my parents if they could call her but they freaked out at me saying that that's extremely rude and that that's a good way for me to lose a stylist and making her Rush would mess up my hair I just want to know if that's an okay question to ask once I get there cuz my parents don't sit in on the appointments with me.