Limits

Some limits are monthly amounts, covered in Plans. The ones below apply on the spot, on every plan.

Builds

	Free	Standard	Pro	Platform	Enterprise
Build timeout	10 min	20 min	30 min	15 min	45 min
Concurrent builds	1	2	4	10	10
Queued builds	3	10	25	100	100
Deployments / day	10	Unlimited	Unlimited	Unlimited	Unlimited
Build machines	standard-1	standard-1, standard-2	standard-1, standard-2, standard-3	standard-1, standard-2, standard-3, standard-4	standard-1, standard-2, standard-3, standard-4

A build past its timeout fails.
Builds past the concurrent builds wait in the build queue; past the queued builds, a new one is refused.
Deployments per day only limits Free.
A CLI upload is limited to 25 MB. See Ignoring files.

	Free	Standard	Pro	Platform	Enterprise
New projects / hour	5	30	60	1,000	120
Environments per project	1	2	3	1	12
Deployments kept for rollback	3	30	100	5	500

Creating projects past the hourly rate is refused with HTTP 429 and a Retry-After header.
Environments per project is a hard limit on every plan.
Only the most recent successful deployments can be rolled back to.

Each request your code handles has a budget, set by your plan:

	Free	Standard	Pro	Platform	Enterprise
CPU per request	15 ms	30 ms	50 ms	50 ms	50 ms
Subrequests per request	10	50	50	50	50

CPU per request: the time your code may spend computing for one request. Waiting on I/O doesn't count.
Subrequests per request: the number of fetch calls your code may make while handling one request.

A request over either fails with an error, and your code can't catch it. Static files aren't affected.

The API answers HTTP 402 with a message naming the limit and what raises it; the CLI and the dashboard show that message. Rate limits answer 429.