Tunnel size

[Coltranetime]

I've been using a really old Chaparral dryer for a really long time. Having constant issues and about ready to put it out of its misery.
The Chaparral has a 6' heat tunnel and the Ryonet Roqit L that I'm looking at only has a 4' tunnel.

Is the 4' sufficient for a medium size shop?

for reference, I'd like to get about 200-250 per hour capacity on dark shirts with white print.

Thanks.