Ask HN: How fast do SaaS sales teams ramp up?

Modeling out a high-level proforma for how a seed round would get us from current state to Series A (say $250K MRR).

One of the questions is how long it takes sales teams to start to get productive. (Bit of a J curve from a cash pov for each hire.)

Any good data points on what the norm is for this?

Grateful for any thoughts / references here :)