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LGA to Manhattan: Q70 busM60 bus from LGA to Manhattan.

Manhattan to JFK: Take the E line from Manhattan to the Jamaica-179th Station and then the Q2 bus to JFK.

Each one will take about an hour. It looks like you're already deducting the 2h early you're supposed to get to the airport from the window (9am to 5:30pm is 8h30m) so I guess doing it this way would give you about 4h in Manhattan.

LGA to Manhattan: Q70 bus from LGA to Manhattan.

Manhattan to JFK: Take the E line from Manhattan to the Jamaica-179th Station and then the Q2 bus to JFK.

Each one will take about an hour. It looks like you're already deducting the 2h early you're supposed to get to the airport from the window (9am to 5:30pm is 8h30m) so I guess doing it this way would give you about 4h in Manhattan.

LGA to Manhattan: M60 bus from LGA to Manhattan.

Manhattan to JFK: Take the E line from Manhattan to the Jamaica-179th Station and then the Q2 bus to JFK.

Each one will take about an hour. It looks like you're already deducting the 2h early you're supposed to get to the airport from the window (9am to 5:30pm is 8h30m) so I guess doing it this way would give you about 4h in Manhattan.

2 added 235 characters in body
source | link

LGA to Manhattan: Q70 bus from LGA to Manhattan.

Manhattan to JFK: Take the E line from Manhattan to the Jamaica-179th Station and then the Q2 bus to JFK.

Each one will take about an hour. It looks like you're already deducting the 2h early you're supposed to get to the airport from the window (9am to 5:30pm is 8h30m) so I guess doing it this way would give you about 4h in Manhattan.

LGA to Manhattan: Q70 bus from LGA to Manhattan.

Manhattan to JFK: Take the E line from Manhattan to the Jamaica-179th Station and then the Q2 bus to JFK.

LGA to Manhattan: Q70 bus from LGA to Manhattan.

Manhattan to JFK: Take the E line from Manhattan to the Jamaica-179th Station and then the Q2 bus to JFK.

Each one will take about an hour. It looks like you're already deducting the 2h early you're supposed to get to the airport from the window (9am to 5:30pm is 8h30m) so I guess doing it this way would give you about 4h in Manhattan.

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source | link

LGA to Manhattan: Q70 bus from LGA to Manhattan.

Manhattan to JFK: Take the E line from Manhattan to the Jamaica-179th Station and then the Q2 bus to JFK.