لطفاً صبر کن

Not if you use 'Lotfan' and use it with friends. With strangers, use 'Sabr konid'.

'Sabr' is the act of being patient. 'Montazer' is the state of being a waiter/expectant.

Yes, but use the formal 'لطفاً منتظر بمانید' for professional emails.

Say 'Montazeram bash' or 'Vaysa ta biyam'.

Technically no, but without it, 'Sabr kon' sounds like a command to a child or a pet.

It's a literal term for aloe vera, but not used in daily conversation about waiting.

It's better to say 'Lotfan ye lahze negah darid' (Please hold/stop for a second).

Say 'Sabr nakon' or 'Montazer namun'.

Yes, 'Vaysa' is the most common slang for 'wait'.

Because it's a core Sufi virtue representing the soul's wait for the beloved.

Yes, 'Sabr kon ta otobus biyad'.

It's an abstract noun, so it doesn't usually have a plural in this context.

Usually, but 'Sabr kon lotfan' is also perfectly fine and common.

Yes, though the pronunciation of 'kon' might sound more like 'kun'.