Normally, stems will be available at an extra charge.
Yes. In addition to the main mix, the delivery will include instrumental, singback and a cappella mix versions. Stems are available at an extra charge.
There is no limit. Under normal circumstances Jonas will work until the mix is finished and everybody is happy.
Yes. For attended sessions, Jonas normally prefers to work in solitude for a few hours and then have the client show up in the afternoon. Non-attended sessions are very common too.
Anything between half a day and three days, with one day being the normal.