2 added response to comment
source | link

ISS crew regularly drops to 3 these days. I'd be very surprised ifBut in the number's ever been lower (becauseearly days, expeditions 7-12 had 2 crew members. Without the Shuttle and before COTS, ATV and HTV, it wasn't practicable to keep a crew of 1 or 2 would have meant unused capacity on3 supplied with Progress alone. (thanks @Pericynthion for the ferry flightaddition).

TheThese days, the ISS needs about 5 people to keep up with its maintenance requirements. With less than 5 aboard, you'll get behind on scheduled maintenance, so I suspect a crew of 3 is not a situation the planners will want to allow for long periods.

So there won't be a hard limit. You could leave the station empty for a couple of hours or days, but maintenance starts to pile up soon.

ISS crew regularly drops to 3 these days. I'd be very surprised if the number's ever been lower (because a crew of 1 or 2 would have meant unused capacity on the ferry flight).

The ISS needs about 5 people to keep up with its maintenance requirements. With less than 5 aboard, you'll get behind on scheduled maintenance, so I suspect a crew of 3 is not a situation the planners will want to allow for long periods.

So there won't be a hard limit. You could leave the station empty for a couple of hours or days, but maintenance starts to pile up soon.

ISS crew regularly drops to 3 these days. But in the early days, expeditions 7-12 had 2 crew members. Without the Shuttle and before COTS, ATV and HTV, it wasn't practicable to keep a crew of 3 supplied with Progress alone. (thanks @Pericynthion for the addition)

These days, the ISS needs about 5 people to keep up with its maintenance requirements. With less than 5 aboard, you'll get behind on scheduled maintenance, so I suspect a crew of 3 is not a situation the planners will want to allow for long periods.

So there won't be a hard limit. You could leave the station empty for a couple of hours or days, but maintenance starts to pile up soon.

1
source | link

ISS crew regularly drops to 3 these days. I'd be very surprised if the number's ever been lower (because a crew of 1 or 2 would have meant unused capacity on the ferry flight).

The ISS needs about 5 people to keep up with its maintenance requirements. With less than 5 aboard, you'll get behind on scheduled maintenance, so I suspect a crew of 3 is not a situation the planners will want to allow for long periods.

So there won't be a hard limit. You could leave the station empty for a couple of hours or days, but maintenance starts to pile up soon.