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Iโm currently having the same issue (trying to install numpy, pandas, and bokeh and hitting the 15 minute heroku compile time limit).
Check out the comments from this answer. (The actual answer does not work/help, as explained in the comments)
Short version is in order to increase this time limit, you need to submit a Heroku Help Ticket. Internally, they can increase the time limit. Issue is it takes a few business days for them to respond to the tickets.
If you (or anyone else) finds another way to fix this error, let me know!
๐คBenji
Source:stackexchange.com