With bar and lines attached as it should always be
From kite rolled up and bar wound to kite flying -
20-30 second if very fast and you are the best
60 seconds easy if you are good
2 minutes+ if you want to chat a bit.
add a few seconds if your deflate is open and you can easily add heaps of time if you get something wrong or goes wrong. Fastest time is achieved with an almost secret technique lol. Somewhat similar to Horst Sergios first vid but on land.
Landing and packing up can offer advantages too. The main one being able to land in tight spots say on grass. The bridles and rolling air out can slow you down a bit but similar to disconnecting lines.
Overall I think foil with bar attached saves me about 10-15mins a session over tubes. Makes very time restricted sessions quite possible and fun. Throw in the mix that changing kite is less painful and the range and low end and longevity of foils is better, there is a lot of things to be happy about them.